Evidence record
What is sending millisecond radio bursts across the universe?
Every sentence on the exploration belongs to at least one claim below. Each says what kind of statement it is, what it rests on, what the evidence does not establish, and how far it was checked. Nothing here is a score, and none of it is a verdict on a belief or a theory.
Last checked 24 September 2026.
- Source checked: 38
- A judgement, not a fact: 10
- Presented as open: 4
If something here is wrong, misquoted, out of date or unfair, write to support@unknownoceans.com and give the claim number, which does not change.
What the question takes for granted
An observational question about an astrophysical population: the bursts are measured in their thousands, one kind of source (a magnetar) is shown to make at least some of them, and whether it makes all of them, and how, is argued in the literature.
The bursts come from the sky, not from the instrument
Established
The first burst was argued to be celestial by its discoverers, and the population was confirmed by 2013; thousands have since been recorded by many telescopes.
They come from across the universe
Established
Almost all are extragalactic, from their dispersion and from the host galaxies found since. The one exception the page describes is the burst from a magnetar inside the Milky Way.
One kind of thing is sending them
Open
The question is phrased in the singular. Whether repeating and one-off bursts share a source, and whether magnetars account for all of them, is what the page reports as unsettled.
How the question is labelled
Claim: Milliseconds
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: Radio bursts
- Kind
- Framing. Signposting. It asserts nothing a source could check.
The question
Claim: Thousands have been recorded.
- Kind
- Present-day figure. A count, survey or report finding, as the named source gives it.
- Review
- Source checked. The cited passage was read, and it says this.
One telescope’s catalogue alone holds 4,539 bursts from 3,641 sources, up to September 2023; the 2022 review counted over 600 published sources.
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Review of the field
The source reads: the currently published sample now exceeds 600 unique sources
Supports
The Second CHIME/FRB Catalog of Fast Radio Burstsabstract; section 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: We present a catalog of 4539 fast radio bursts (FRBs) observed with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope between 25 July 2018 and 15 September 2023.
What this does not establish
One telescope’s count, of bursts it could detect; the catalogue’s section 2 lists the selection criteria the 4,539 met.
Later work looked for
arXiv, 2025 on, "Second CHIME/FRB Catalog": the 2026 catalogue of 4,539 bursts supersedes the review’s count and confirms "thousands".
Claim 3 · checked 24 September 2026 · AI-assisted audit
Claim: One came from inside our own galaxy
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Here we report the detection of an extremely intense radio burst from the Galactic magnetar SGR 1935+2154
Supports
A fast radio burst associated with a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Here we present the discovery of a millisecond-duration radio burst from the Galactic magnetar SGR 1935+2154
Later work looked for
Crossref and the 2022 review, 2020 on: the association of the April 2020 burst with SGR 1935+2154 is not disputed in anything found.
Claim 4 · checked 24 September 2026 · AI-assisted audit
Claim: which narrowed the field considerably.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s reading. It follows from the review’s judgement that the detection is strong circumstantial evidence for a magnetar link.
Context
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: these detections are consistent with being part of the low end of a broad luminosity function, and provide strong circumstantial evidence linking magnetars and FRBs.
Claim 5 · checked 24 September 2026 · AI-assisted audit
Claim: A fast radio burst usually lasts a few milliseconds or less
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetaropening paragraph
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Fast radio bursts (FRBs) are millisecond-duration bursts of radio waves arriving from cosmological distances
Qualifies
Fast radio bursts at the dawn of the 2020sfigure 4 caption
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: is a remarkable event, lasting for nearly 3 seconds and showing 9 peaks separated by a strict period of 216.8 ms
What this does not establish
"Usually" matters: one burst lasted nearly three seconds, as the page says later.
Later work looked for
The second CHIME/FRB catalogue (2026) abstract, searched on arXiv: it measures widths for 4,539 bursts and reports no change to the millisecond scale.
Corrected
24 September 2026. Previously: “A fast radio burst releases in a thousandth of a second as much energy as the Sun emits in days.” The energy comparison had no source and burst energies span many orders of magnitude, so no single figure is "a fast radio burst". It is now tied to the one estimate a cited paper gives (Lorimer and others, about 10^33 joules) against NASA’s solar luminosity, which is about a month of sunlight; and the duration is a few milliseconds, not one.
Claim 6 · checked 24 September 2026 · AI-assisted audit
Claim: and the first one found released, on its discoverers' estimate, as much energy as the Sun emits in about a month.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: we estimate the brightness temperature and energy released to be ... ∼ 10³³ W₅ D²₅₀₀ J respectively
Notation restored: Superscripts and subscripts restored from page 6 of the arXiv PDF of arXiv:0709.4301, rendered and read 2026-09-24. The text as extracted reads: we estimate the brightness temperature and energy released to be ... ∼ 1033W5D2 500 J respectively
About 10^33 joules, scaled by the burst width over 5 ms and by the square of the distance over 500 Mpc.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: To enable some indicative calculations about potential source luminosity and event rates we adopt a distance of 500 Mpc.
Supports
Sun Fact Sheetbulk parameters, Luminosity
Cited · Link answered, 19 October 2026 · The cited passage was read, 24 September 2026 · Reference work
The source reads: Luminosity (10²⁴ J/s) 382.8
Notation restored: The superscript restored from the fact sheet’s HTML (10<sup>24</sup>), read 2026-09-24. The text as extracted reads: Luminosity (1024 J/s) 382.8
10^33 J divided by 3.828 × 10^26 J/s is about 2.6 million seconds, or 30 days.
Qualifies
A bright millisecond-duration radio burst from a Galactic magnetarp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: This implies an emitted energy of 10⁴² − 10⁴³ erg. This is eight to nine orders of magnitude more energetic than the burst from SGR 1935+2154.
Notation restored: Superscripts restored from page 6 of the arXiv PDF of arXiv:2005.10324, rendered and read 2026-09-24. The text as extracted reads: This implies an emitted energy of 1042− 1043 erg. This is eight to nine orders of magnitude more energetic than the burst from SGR 1935+2154.
What this does not establish
An indicative figure at an assumed distance of 500 Mpc, taking the emission as spread in all directions. Bursts differ widely: the CHIME paper cites one some eight to nine orders of magnitude more energetic than the Galactic burst.
Later work looked for
The CHIME/FRB magnetar paper (2020) and the 2022 review: later bursts span a far wider range of energies; the first burst’s estimate is not revised.
Claim 7 · checked 24 September 2026 · AI-assisted audit
Claim: The 2020 detection of one from a known magnetar in the Milky Way established that at least some have a plausible source
- Kind
- What the field holds. The settled view of a field, as a review, a consensus statement or a reference work gives it. Not one study.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020sabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: The recent detection of a bright FRB-like burst from the Galactic magnetar SGR 1935+2154 provides an important link between FRBs and magnetars.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: strongly supporting the notion that magnetars are the origin of at least some FRBs.
What this does not establish
A plausible source, not a demonstrated one for any distant burst: the review calls the link circumstantial evidence.
Later work looked for
Crossref and arXiv, 2022 on, "fast radio burst magnetar": the polarisation and scintillation of one 2022 burst (Mckinven and others; Nimmo and others, 2025) add support for a neutron-star engine; nothing found reverses the link.
Claim 8 · checked 24 September 2026 · AI-assisted audit
Claim: without explaining the rest.
- Kind
- Open question. Something the page says is not known.
- Review
- Presented as open. The page says this is unresolved, and the review found that it is.
Supports
Fast radio bursts at the dawn of the 2020ssection 3.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Even more so than radiation mechanisms, the progenitor engines of FRBs are broadly debated in the literature.
Claim 9 · checked 24 September 2026 · AI-assisted audit
Claim: The first one was found in archived data in 2007
- Kind
- Historical claim. A statement about the past that historical evidence can test.
- Review
- Source checked. The cited passage was read, and it says this.
The burst itself was recorded at Parkes in August 2001 and found in the archive in 2007.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: In analysis of archival survey data
Supports
Fast radio bursts at the dawn of the 2020sabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Since the discovery of the first fast radio burst (FRB) in 2007
Claim 10 · checked 24 September 2026 · AI-assisted audit
Claim: and for years it was reasonable to wonder whether the instrument had done it.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The discoverers argued against terrestrial interference in the paper itself, and the population was confirmed six years later. The page’s reading is that doubt was reasonable in between.
Context
A Bright Millisecond Radio Burst of Extragalactic Originp. 4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: Furthermore, terrestrial interference often repeats, and this was the only significantly dispersed burst detected
Context
Fast radio bursts at the dawn of the 2020sabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: their confirmation as an abundant extragalactic population in 2013
Claim 11 · checked 24 September 2026 · AI-assisted audit
Claim: They are real, they are extragalactic
- Kind
- What the field holds. The settled view of a field, as a review, a consensus statement or a reference work gives it. Not one study.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: FRB pulses show much larger dispersive delays, consistent with an extragalactic origin
Supports
Fast radio bursts at the dawn of the 2020sfigure 2 caption
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: it has been shown that the underlying distribution is isotropic, as expected for a cosmological population.
What this does not establish
Almost all of them: one burst came from a magnetar inside the Milky Way.
Later work looked for
The 2022 review counts 19 host galaxies and later host samples (Sharma and others, 2024: 30 hosts) place the bursts in other galaxies; nothing changes it.
Claim 12 · checked 24 September 2026 · AI-assisted audit
Claim: and until recently nobody could point at anything capable of producing one.
- Kind
- Historical claim. A statement about the past that historical evidence can test.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetaropening paragraph
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation
The source reads: However, a challenge to this model has been that FRBs must have radio luminosities many orders of magnitude larger than those seen from known Galactic magnetars.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 6
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: Hence, it appears to represent an entirely new class of radio source.
What this does not establish
Models were proposed throughout; what was missing was a known object seen to produce a burst of this kind.
Claim 13 · checked 24 September 2026 · AI-assisted audit
What is recorded
Claim: What is recorded
- Kind
- Framing. Signposting. It asserts nothing a source could check.
What a burst looks like
Claim: What a burst looks like
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: A pulse a few milliseconds long, bright in radio, and smeared in a very particular way
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: a 30-Jy dispersed burst of duration < 5 ms
Later work looked for
The 2022 review, section 2.3: microsecond structure has since been found inside some bursts; the millisecond envelope stands.
Claim 16 · checked 24 September 2026 · AI-assisted audit
Claim: the low frequencies arrive after the high ones, because the intervening plasma slows them differently.
- Kind
- What the field holds. The settled view of a field, as a review, a consensus statement or a reference work gives it. Not one study.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: exhibit the frequency-dependent arrival time delay due to dispersion that is well known for Galactic radio pulsars
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: The plasma, which exists within our Galaxy and in extragalactic space, has a refractive index which is frequency dependent.
Later work looked for
How the method works; not a finding later work revises.
Claim 17 · checked 24 September 2026 · AI-assisted audit
Claim: That smearing is the useful part.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s signpost to what follows; the uses are sourced in the claims after it.
Claim 18 · checked 24 September 2026 · AI-assisted audit
Claim: Its size measures how much ionised material the signal crossed
- Kind
- What a model says. What a theory or model predicts or describes, which is not the same as what has been observed.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Theory
The source reads: the integrated column density of free electrons along the line of sight, known as the dispersion measure (DM)
Supports
A census of baryons in the Universe from localized fast radio burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: an effect that measures the electron column density along each sight line
What this does not establish
It measures the total along the whole path. Dividing it between our galaxy, the space between galaxies and the host takes models of each, which is why the page’s later claims need host distances.
Claim 19 · checked 24 September 2026 · AI-assisted audit
Claim: and for these bursts it is far more than our own galaxy can supply
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: predicts a DM contribution of only 25 cm−3 pc for this line of sight.
Against a measured DM of 375.
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: FRB pulses show much larger dispersive delays, consistent with an extragalactic origin
Later work looked for
The 2022 review and later host galaxy samples: the dispersion excess is now matched by measured host redshifts (Macquart and others, 2020); nothing changes it.
Claim 20 · checked 24 September 2026 · AI-assisted audit
Claim: which is how they were argued to be extragalactic before any host galaxy was identified.
- Kind
- Historical claim. A statement about the past that historical evidence can test.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: strongly suggest that the source is well beyond
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: at which point only one host galaxy identification (for the first-known repeater) was conclusively made
Corrected
24 September 2026. Previously: “which is how they were shown to be extragalactic before any host galaxy was identified.” The discovery paper argues the case ("argue against", "strongly suggest"); proof came with host galaxies.
Claim 21 · checked 24 September 2026 · AI-assisted audit
Claim: Reading one burst
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: A few milliseconds of radio emission, sweeping from high frequency to low.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 3
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: The pulse exhibits the characteristic quadratic delay as a function of radio frequency
Later work looked for
As claim 16: the millisecond envelope stands.
Claim 23 · checked 24 September 2026 · AI-assisted audit
Claim: The source is compact: for the first burst, light-travel time limited it to under 1,500 kilometres, unless it was moving close to the speed of light.
- Kind
- What scholars argue. A report of what specialists argue, or where they disagree.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: limit the source size to < 1500 km, for a non-relativistic source imply a coherent emission process from a compact region.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: are larger by a factor of either Γ (for a steady jet model) or Γ² (for an impulsive blast model)
Notation restored: The superscript restored from page 6 of the arXiv PDF of arXiv:0709.4301, rendered and read 2026-09-24. The text as extracted reads: are larger by a factor of either Γ (for a steady jet model) or Γ 2 (for an impulsive blast model)
Corrected
24 September 2026. Previously: “The source is small: nothing larger than a few hundred kilometres can vary that fast.” The discovery paper gives under 1,500 km for a five-millisecond burst, and says a relativistic source can be larger; "a few hundred kilometres" and "nothing larger" were both stronger than the source.
Claim 24 · checked 24 September 2026 · AI-assisted audit
Claim: The delay between frequencies is large.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: predicts a DM contribution of only 25 cm−3 pc for this line of sight.
Against a measured DM of 375.
Later work looked for
As claim 20: nothing changes it.
Claim 25 · checked 24 September 2026 · AI-assisted audit
Claim: The signal crossed far more ionised gas than lies within our galaxy, so it came from outside it.
- Kind
- What the field holds. The settled view of a field, as a review, a consensus statement or a reference work gives it. Not one study.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: FRB pulses show much larger dispersive delays, consistent with an extragalactic origin
Supports
A Bright Millisecond Radio Burst of Extragalactic Originp. 4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: high DM of the burst make it highly improbable for the source to be located within our Galaxy.
Later work looked for
As claim 12: nothing changes it.
Claim 26 · checked 24 September 2026 · AI-assisted audit
Claim: Some sources repeat, others have never been seen twice.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Review of the field
The source reads: many repeaters have only been seen twice. This suggests that many currently one-off sources may be seen to produce a second (or third, etc.) burst, given enough follow-up.
Context
The Second CHIME/FRB Catalog of Fast Radio Burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: These bursts originate from 3641 unique sources, including 981 bursts from 83 known repeating sources.
Later work looked for
arXiv, 2025 on, "Second CHIME/FRB Catalog": 83 repeaters among 3,641 sources to September 2023; the split stands.
Claim 27 · checked 24 September 2026 · AI-assisted audit
Claim: Either two populations, or one population where repetition is easy to miss.
- Kind
- Open question. Something the page says is not known.
- Review
- Presented as open. The page says this is unresolved, and the review found that it is.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Whether this demonstrates different types of sources, or whether it can be accommodated by a different (and more sporadic) emission mechanism from the same type of source, is unknown.
Qualifies
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: It thus appears that there are likely at least two types of FRBs, and that one-offs are not just simply less active sources.
Other readings
The 2022 review leans towards at least two types, because repeaters’ bursts are wider in time and narrower in frequency, while leaving open whether the difference is in the source or in how it emits.
Claim 28 · checked 24 September 2026 · AI-assisted audit
One came from a magnetar we already knew about
Claim: One came from a magnetar we already knew about
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarp. 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: the CHIME/FRB instrument detected a dispersed radio burst during a period of unusually intense X-ray burst activity
Supports
A bright millisecond-duration radio burst from a Galactic magnetarp. 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: from the known Galactic magnetar SGR 1935+2154
Later work looked for
As claim 4: not disputed in anything found.
Claim 29 · checked 24 September 2026 · AI-assisted audit
Claim: In April 2020 a burst arrived bright enough that the CHIME telescope caught it far outside the patch of sky it was pointed at
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarp. 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: far sidelobe event, well outside the
Supports
A fast radio burst associated with a Galactic magnetardiscovery section
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: which was outside the direct field of view of CHIME at the time
Later work looked for
As claim 4: not disputed in anything found.
Corrected
24 September 2026. Previously: “In April 2020 a burst arrived that was bright enough to be seen by instruments not designed for it” Of the two radio instruments, STARE2 was built to look for bursts in the Milky Way. What the sources say is unusual is that CHIME caught it in a far sidelobe, outside its field of view.
Claim 30 · checked 24 September 2026 · AI-assisted audit
Claim: and it came from SGR 1935+2154, a magnetar inside the Milky Way.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Here we report the detection of an extremely intense radio burst from the Galactic magnetar SGR 1935+2154
Later work looked for
As claim 4: not disputed in anything found.
Claim 31 · checked 24 September 2026 · AI-assisted audit
Claim: CHIME and a second instrument, STARE2, reported it independently in Nature.
- Kind
- Historical claim. A statement about the past that historical evidence can test.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A fast radio burst associated with a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: This event, termed ST 200428A(=FRB 200428), was detected on 28 April 2020 by the STARE2 radio array
Supports
A bright millisecond-duration radio burst from a Galactic magnetarCrossref record
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
Nature 587, pages 54 to 58; the STARE2 paper is Nature 587, pages 59 to 62, in the same issue.
Corrected
24 September 2026. Previously: “The event was recorded in Nature as a bright millisecond-duration radio burst from a Galactic magnetar.” The page named one of two independent detections, published side by side. The STARE2 paper is added as a source.
Claim 32 · checked 24 September 2026 · AI-assisted audit
Claim: That single detection did more than years of theory.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s judgement. It follows from the discovery paper’s statement that one event closed most of the gap the magnetar model had faced.
Context
A bright millisecond-duration radio burst from a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: This event thus bridges a large fraction of the radio energy gap between the population of Galactic magnetars and FRBs
Claim 33 · checked 24 September 2026 · AI-assisted audit
Claim: It showed that an object of a known type, in a known place, can produce a burst with the right properties
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A bright millisecond-duration radio burst from a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Such a burst coming from a nearby galaxy would be indistinguishable from a typical FRB.
Supports
A fast radio burst associated with a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: is arguably drawn from the same population as the observed FRB sample.
Qualifies
Fast radio bursts at the dawn of the 2020ssection 2.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: This null result suggests that associations between SGR bursts and FRBs are very rare.
What this does not establish
The magnetar produced a burst like this rarely: later X-ray activity from it came without FRB-like radio pulses.
Later work looked for
Crossref and arXiv, 2022 on: nothing found revises the burst’s properties; the 2022 review adds that such bursts are rare for this magnetar.
Claim 34 · checked 24 September 2026 · AI-assisted audit
Claim: even if the one from our own galaxy was less energetic than the distant ones.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A fast radio burst associated with a Galactic magnetarabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: ST 200428A is just 40 times less energetic than the weakest extragalactic FRB observed to date
Supports
A bright millisecond-duration radio burst from a Galactic magnetarp. 5
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: This places the event from SGR 1935+2154 only 1–2 orders of magnitude below the observed burst energies of the typical FRBs
Later work looked for
The 2022 review, section 2.2: it is brighter than some bursts from the nearby M81 repeater, so the gap is closing from both ends; the page’s wording still holds.
Claim 35 · checked 24 September 2026 · AI-assisted audit
What is arguable
Claim: What is arguable
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Whether magnetars explain all of them
Claim: Whether magnetars explain all of them
- Kind
- Open question. Something the page says is not known.
- Review
- Presented as open. The page says this is unresolved, and the review found that it is.
Supports
Fast radio bursts at the dawn of the 2020ssection 3.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Even more so than radiation mechanisms, the progenitor engines of FRBs are broadly debated in the literature.
Claim 37 · checked 24 September 2026 · AI-assisted audit
Claim: Some sources repeat, sometimes with a regular window of activity.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
About 16 days for one source and about 160 days for the other, in the review’s section 2.4.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Review of the field
The source reads: two sources show a periodicity in their activity level
Later work looked for
Crossref, 2022 on, "periodic activity repeating fast radio burst": nothing read that withdraws either period.
Claim 38 · checked 24 September 2026 · AI-assisted audit
Claim: Most have been seen only once: of 3,641 sources in the CHIME/FRB catalogue for 2018 to 2023, 83 have repeated.
- Kind
- Present-day figure. A count, survey or report finding, as the named source gives it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
The Second CHIME/FRB Catalog of Fast Radio Burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: observed with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope between 25 July 2018 and 15 September 2023. These bursts originate from 3641 unique sources, including 981 bursts from 83 known repeating sources.
Supports
The Second CHIME/FRB Catalog of Fast Radio BurstsFigure 1 caption
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Sky distributions of 3558 non-repeating sources and 83 repeating sources
3,558 plus 83 is 3,641; 83 is about 2 per cent of the sources.
What this does not establish
A source counted once may yet repeat: the catalogue reports cumulative exposure for each burst, and one-off sources had different amounts of it.
Later work looked for
The catalogue is itself the newest count found (arXiv, January 2026).
Corrected
24 September 2026. Previously: “Others have been seen once despite years of monitoring.” The page gave no source for years of monitoring of any one-off source. The largest catalogue gives the proportion directly; it is added as a source.
Claim 39 · checked 24 September 2026 · AI-assisted audit
Claim: Those may be different objects, or the same objects caught in different states.
- Kind
- Open question. Something the page says is not known.
- Review
- Presented as open. The page says this is unresolved, and the review found that it is.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Whether this demonstrates different types of sources, or whether it can be accommodated by a different (and more sporadic) emission mechanism from the same type of source, is unknown.
Claim 40 · checked 24 September 2026 · AI-assisted audit
Claim: Host galaxies vary too: most bursts traced so far come from star-forming galaxies, where young magnetars are expected
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Preferential occurrence of fast radio bursts in massive star-forming galaxiesarXiv PDF, first paragraph
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Observational study: associations, not causes
The source reads: and the typically star-forming nature of FRB host galaxies
Supports
Preferential occurrence of fast radio bursts in massive star-forming galaxiesarXiv PDF, results
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Observational study: associations, not causes
The source reads: the close alignment of FRB host galaxies with the star-forming main sequence of galaxies
Supports
A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent GalaxyarXiv PDF, section 4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: the majority of the FRB population, characterized primarily by star-forming galaxies
Supports
Fast radio bursts at the dawn of the 2020ssection 3.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: the FRB population remains consistent with being powered by magnetars formed in core-collapse supernovae (CCSNe)
Supports
Fast radio bursts at the dawn of the 2020ssection 2.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: FRBs can be hosted in a wide range of galaxy types and environments
What this does not establish
Host samples are still tens of galaxies (Sharma and others had 30 hosts from 42 bursts), and each survey selects its own.
Later work looked for
Crossref, 2023 on, "fast radio burst host galaxies": Sharma and others (Nature, 2024) find hosts are mostly massive star-forming galaxies; page updated to say "most".
Corrected
24 September 2026. Previously: “Host galaxies vary too: some bursts come from star-forming regions where young magnetars are expected” "Some" understated the balance: the largest host sample found is mostly star-forming galaxies. The review also says star-forming regions are close to some repeaters, not that bursts come from them. Sharma and others (2024) is added as a source.
Claim 41 · checked 24 September 2026 · AI-assisted audit
Claim: but some come from older stellar populations where they are not.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Review of the field
The source reads: some non-repeaters have been found in galactic hosts with very low star-formation rates, and even in the outskirts of such galaxies
Later work looked for
arXiv, 2024 on: a repeater in the outskirts of a quiescent elliptical galaxy (Shah and others, 2025) adds to the old-population cases.
Claim 42 · checked 24 September 2026 · AI-assisted audit
Claim: One repeater has been traced to a globular cluster belonging to the nearby galaxy M81, where the stars are old
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A repeating fast radio burst source in a globular clusterabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: which allows us to associate it with a globular cluster (GC) in the M81 galactic system
Supports
A repeating fast radio burst source in a globular clusterabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Because such GCs host old stellar populations, this association strongly challenges FRB models that invoke young magnetars formed in a core-collapse supernova
Later work looked for
Crossref and arXiv, 2022 on, "FRB 20200120E": the association stands; the 2022 review notes this source may not be representative.
Corrected
24 September 2026. Previously: “One repeater has been traced to a globular cluster in a nearby galaxy, which is about as old a stellar environment as there is.” The paper says globular clusters host old stellar populations, not that none is older; the superlative went beyond it. A second old-population repeater (Shah and others, 2025) is added from later work.
Claim 43 · checked 24 September 2026 · AI-assisted audit
Claim: and another to the far outskirts of a quiescent elliptical galaxy.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent Galaxyabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: enabled a robust association of FRB 20240209A to the outskirts of a luminous galaxy
Supports
A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent Galaxyabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: making it the FRB with the largest host galaxy offset to date ... the quiescent, elliptical nature of the host as demonstrated in our companion paper
Supports
A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent GalaxyarXiv PDF, section 3
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Using the spectrum of the host galaxy, we classify it as a quiescent galaxy ... FRB 20240209A is also the first FRB localized to a galaxy with unambiguous elliptical morphology
Supports
A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent GalaxyarXiv PDF, section 3
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: demonstrating a location well outside the locus of the host galaxy light
The paper gives a projected offset of 40 ± 5 kpc, about five times the host’s effective radius.
What this does not establish
The elliptical classification is from the team’s companion paper, which Shah and others cite and which was not read. The team finds a globular cluster origin most plausible, not proven.
Later work looked for
This is the newer work (2025); nothing later found.
Claim 44 · checked 24 September 2026 · AI-assisted audit
What powers the emission
Claim: What powers the emission
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: Even granting a magnetar, the mechanism is argued: a shock far from the star, or emission from within its magnetosphere, near the star itself.
- Kind
- What scholars argue. A report of what specialists argue, or where they disagree.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 3.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Most models center around an energetic neutron star or magnetar progenitor but place the location of emission at different radial distances from the surface of the star
Supports
Fast radio bursts at the dawn of the 2020ssection 3.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: In some models the FRB is generated by reconnection in the neutron star magnetosphere
Supports
Fast radio bursts at the dawn of the 2020ssection 3.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: the FRB is generated via synchrotron maser emission in the forward shock of a propagating flare from the magnetar
Corrected
24 September 2026. Previously: “Even granting a magnetar, the mechanism is argued: a shock far from the star, or emission from close to the magnetic poles.” The review places the second class in the magnetosphere or near the surface; it says nothing about the magnetic poles.
Claim 46 · checked 24 September 2026 · AI-assisted audit
Claim: The two put the emission at very different distances, which shows in the size of the emitting region and in how the polarisation turns across a burst.
- Kind
- What a model says. What a theory or model predicts or describes, which is not the same as what has been observed.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020ssection 3.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: may rule out mechanisms where FRBs are generated at large radii from the central neutron star
Supports
Fast radio bursts at the dawn of the 2020ssection 2.3
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: of the polarisation angle swings seen from pulsars, and suggest an origin in a rotating magnetosphere – though other interpretations remain possible.
Supports
Magnetospheric origin of a fast radio burst constrained using scintillationarXiv PDF, first paragraph
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: The expected emission region sizes are notably different between these two types of models.
What this does not establish
What the models predict, not what is measured. The review notes that both classes have explained most observations so far, and that a polarisation swing can be read other ways.
Corrected
24 September 2026. Previously: “The two predict different polarisation and different behaviour across frequencies, and the data are improving faster than the models.” The review gives emission radius, microstructure and polarisation swings as the discriminators, and names wide-band detection only as a possible future test. The clause about the data outpacing the models repeated the next paragraph and was dropped.
Claim 47 · checked 24 September 2026 · AI-assisted audit
Claim: For one nearby burst, detected in 2022, both now point to the magnetosphere.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A pulsar-like polarization angle swing from a nearby fast radio burstabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: The PA evolution disfavours emission models involving shocks far from the source and instead suggests magnetospheric origins for this source
Supports
Magnetospheric origin of a fast radio burst constrained using scintillationabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: We find that this is inconsistent with the expected emission sizes for the large radial distance models, and is more naturally explained with an emission process that operates within or just beyond the magnetosphere of a central compact object.
Supports
A pulsar-like polarization angle swing from a nearby fast radio burstabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Here, we report on a fast radio burst, FRB 20221022A, detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and localized to a nearby host galaxy
Context
Fast radio bursts at the dawn of the 2020ssection 1, note 2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: which includes the year, month, day
The naming convention: FRB 20221022A arrived on 22 October 2022.
What this does not establish
One burst, not the population: the teams say what it suggests for this source. Mckinven and others note that the polarisation changes seen in other FRBs tend to be smaller and more erratic than in pulsars.
Later work looked for
This is the newer work (2025). Crossref search for a rebuttal of either paper found none.
Corrected
24 September 2026. Previously: “” Two 2025 papers on the same burst measure exactly the properties the passage names and both favour the magnetosphere; the page left them out. Added as sources.
Claim 48 · checked 24 September 2026 · AI-assisted audit
Claim: This is a field where the observations are currently ahead of the theory.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s reading of the review: the sample has grown faster than the models have been able to separate themselves.
Context
Fast radio bursts at the dawn of the 2020ssection 3.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: It is difficult to differentiate between these models based on most observed properties of FRBs, as both flavors of model have been able to explain most observations to-date with relative comfort.
Context
Fast radio bursts at the dawn of the 2020ssection 3
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: Prior to PHL19, the number of known FRBs and theories for their origins grew roughly at the same pace.
Corrected
24 September 2026. Previously: “This is a field where the observations are currently ahead of the theory, which is not the usual direction.” Whether observation leading theory is unusual in astronomy is a claim about the whole science that no cited source makes. Removed.
Claim 49 · checked 24 September 2026 · AI-assisted audit
What does not fit
Claim: What does not fit
- Kind
- Framing. Signposting. It asserts nothing a source could check.
What the rarest ones are
Claim: What the rarest ones are
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: A handful of events look unlike the rest, such as a burst of nearly three seconds whose nine peaks keep a strict 216.8-millisecond beat
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
Fast radio bursts at the dawn of the 2020sfigure 4 caption
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Review of the field
The source reads: is a remarkable event, lasting for nearly 3 seconds and showing 9 peaks separated by a strict period of 216.8 ms
Supports
Fast radio bursts at the dawn of the 2020ssection 2.4
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: it is curious that only one out of hundreds of FRB sources has clearly shown this behaviour.
Supports
Fast radio bursts at the dawn of the 2020ssection 2.2
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: suggest that, perhaps, it is not representative of the broader population
Later work looked for
The second CHIME/FRB catalogue abstract (2026): a much larger sample, with population studies of it still to come; nothing found that explains the outliers.
Corrected
24 September 2026. Previously: “A handful of events do not fit comfortably into any current account” "Do not fit any current account" is stronger than the review, which says such events look rare and may differ in origin. Narrowed to what it reports, with its clearest example.
Claim 52 · checked 24 September 2026 · AI-assisted audit
Claim: and with a population this large and this recently discovered, the tail of the distribution is barely sampled.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s reading of the review’s expectation of further sub-populations.
Context
Fast radio bursts at the dawn of the 2020ssection 2.1
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Review of the field
The source reads: As the known FRB population continues to increase rapidly, further sub-populations may become apparent.
Claim 53 · checked 24 September 2026 · AI-assisted audit
Claim: The honest position is that the common ones are becoming explicable and the unusual ones are not.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s summary of claims 8, 48 and 52: a magnetar link for the population, outliers that the review leaves unexplained.
Claim 54 · checked 24 September 2026 · AI-assisted audit
What they are good for
Claim: What they are good for
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: The observations are currently ahead of the theory.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
Repeats claim 49 as an interlude.
Corrected
24 September 2026. Previously: “The observations are currently ahead of the theory, which is not the usual direction.” As claim 49.
Claim 56 · checked 24 September 2026 · AI-assisted audit
What they are becoming useful for
Claim: What they are becoming useful for
- Kind
- Framing. Signposting. It asserts nothing a source could check.
Claim: The same smearing that made them puzzling makes them instruments.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s framing of the measurement described in the next sentence.
Claim 58 · checked 24 September 2026 · AI-assisted audit
Claim: Each burst measures the ionised material along its path, and with enough of them at known distances the diffuse matter between galaxies can be weighed.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A census of baryons in the Universe from localized fast radio burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: Here we report the direct measurement of the baryon content of the Universe using the dispersion of a sample of localized fast radio bursts (FRBs), thus utilizing an effect that measures the electron column density along each sight line and accounts for every ionised baryon
Later work looked for
arXiv, 2024 on, "missing baryons fast radio bursts": Connor and others (Nature Astronomy, 2025) repeat the measurement with a larger localised sample.
Claim 59 · checked 24 September 2026 · AI-assisted audit
Claim: That material had been predicted and only partly located
- Kind
- Historical claim. A statement about the past that historical evidence can test.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A census of baryons in the Universe from localized fast radio burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: More than three quarters of the baryonic content of the Universe resides in a highly diffuse state that is difficult to observe
Supports
A census of baryons in the Universe from localized fast radio burstsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: provide evidence of some of the gas in filamentary structures
Corrected
24 September 2026. Previously: “That material had been predicted and not located” The paper itself cites absorption, Sunyaev-Zel’dovich and X-ray work that had found some of it.
Claim 60 · checked 24 September 2026 · AI-assisted audit
Claim: and fast radio bursts have now counted it: five well-placed bursts in 2020 found the amount the early universe requires
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A census of baryons in the Universe from localized fast radio burstsmain text
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: the FRB measurements confirm the presence of baryons with the density estimated from the CMB and BBN, and these five measurements are consistent with all the missing baryons being present in the ionized intergalactic medium.
Qualifies
A census of baryons in the Universe from localized fast radio burstsmain text
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026
The source reads: with only five (seven) burst redshifts the experiment yields a precision of
About 30 per cent.
What this does not establish
A measurement with about 30 per cent uncertainty from five bursts: consistent with the expected amount, not a precise count.
Later work looked for
arXiv, 2024 on: Connor and others (2025) give a tighter total, about 12 per cent, with a larger sample.
Corrected
24 September 2026. Previously: “and fast radio bursts are turning out to be the way to find it.” "The way" set aside the other methods the paper names. Replaced with what the 2020 paper and its 2025 successor (added as a source) measured.
Claim 61 · checked 24 September 2026 · AI-assisted audit
Claim: and a larger sample in 2025 began to say where it lies.
- Kind
- Observation. Something measured or seen, as the named source reports it.
- Review
- Source checked. The cited passage was read, and it says this.
Supports
A gas-rich cosmic web revealed by the partitioning of the missing baryonsabstract
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: We have robustly partitioned the missing baryons into the IGM, galaxy clusters, and galaxies
Supports
A gas-rich cosmic web revealed by the partitioning of the missing baryonsarXiv PDF, Figure 1 caption
Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Astronomical observation · Measurement
The source reads: in our sample, over half of which are sources recently discovered by the DSA-110 ... The five cyan squares are the sample that was used to derive the original “Macquart Relation”
What this does not establish
A statistical partition across the sample, with stated uncertainties (an intergalactic fraction of 0.76, plus 0.10 or minus 0.11), not a map of where the gas sits along any one sight line.
Later work looked for
This is the newer work (Nature Astronomy, 2025); nothing later found.
Claim 62 · checked 24 September 2026 · AI-assisted audit
Claim: A mystery converted into a measuring device is one of the more satisfying things astronomy does.
- Kind
- This page’s reading. A judgement the page makes from the evidence. Others read it differently.
- Review
- A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.
The page’s judgement; nothing turns on it.
Claim 63 · checked 24 September 2026 · AI-assisted audit
What was read
- A bright millisecond-duration radio burst from a Galactic magnetarCHIME/FRB Collaboration, Nature · arXiv:2005.10324v2 (15 June 2020); read the main textRead in full, 24 September 2026 · Copyright; quoted brieflyPDF text extraction flattens superscripts ("1042" is 10^42).
- A census of baryons in the Universe from localized fast radio burstsMacquart, Prochaska, McQuinn and others, Nature 581 · arXiv:2005.13161v1 (27 May 2020); read the main textRead in full, 24 September 2026 · Copyright; quoted briefly
- A repeating fast radio burst source in a globular clusterKirsten, Marcote, Nimmo and others, Nature 602 · arXiv:2105.11445v2; read abstract, localisation and discussionRead in full, 24 September 2026 · Copyright; quoted briefly
- Fast radio bursts at the dawn of the 2020sPetroff, Hessels and Lorimer, The Astronomy and Astrophysics Review 30 · arXiv:2107.10113v2 (19 January 2022); read abstract, sections 1 to 3 and the section 4.1 headingRead in full, 24 September 2026 · CC BY 4.0 (published version)
- A Bright Millisecond Radio Burst of Extragalactic OriginLorimer, Bailes, McLaughlin and others, Science 318, pages 777 to 780 · arXiv:0709.4301v1 (27 September 2007), the accepted manuscript; read in fullRead in full, 24 September 2026 · Copyright; quoted brieflyPDF text extraction flattens superscripts ("1033" is 10^33) and splits some words; excerpts keep the extracted spacing.
- A fast radio burst associated with a Galactic magnetarBochenek, Ravi, Belov and others, Nature 587, pages 59 to 62 · arXiv:2005.10828v1; read abstract and the discovery sectionRead in full, 24 September 2026 · Copyright; quoted briefly
- The Second CHIME/FRB Catalog of Fast Radio BurstsCHIME/FRB Collaboration, arXiv preprint 2601.09399 · arXiv:2601.09399, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · CC BY 4.0
- Preferential occurrence of fast radio bursts in massive star-forming galaxiesSharma, Ravi, Connor and others, Nature 635, pages 61 to 66 · arXiv:2409.16964, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · arXiv non-exclusive distribution licence; quoted briefly
- A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent GalaxyShah, Shin, Leung and others, The Astrophysical Journal Letters 979, L21 · arXiv:2410.23374, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · CC BY 4.0
- A pulsar-like polarization angle swing from a nearby fast radio burstMckinven, Bhardwaj, Eftekhari and others, Nature 637, pages 43 to 47 · arXiv:2402.09304, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · CC BY 4.0
- Magnetospheric origin of a fast radio burst constrained using scintillationNimmo, Pleunis, Beniamini and others, Nature 637, pages 48 to 51 · arXiv:2406.11053, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · CC BY 4.0
- A gas-rich cosmic web revealed by the partitioning of the missing baryonsConnor, Ravi, Sharma and others, Nature Astronomy 9, pages 1226 to 1239 · arXiv:2409.16952, the arXiv PDF read in full (the abstract was read first)Read in full, 24 September 2026 · CC BY 4.0
- Sun Fact SheetNASA Space Science Data Coordinated Archive · NSSDCA Sun Fact Sheet, bulk parameters tableThe cited passage was read, 24 September 2026 · Public domain (US government work)The table prints the unit as "1024 J/s", meaning 10^24 joules per second.