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Astronomers have traced a fast radio burst called FRB 20240304B to a small, star-forming dwarf galaxy, using NASA’s James Webb Space Telescope to find the host after ground-based searches could not. The burst’s light left its source more than 10.7 billion years ago, when the universe was only about 3 billion years old. The host’s youth and low mass favor a young, highly magnetized neutron star, known as a magnetar, as the source of this particular burst. The finding does not solve the broader fast radio burst mystery, and the physical origin of these bursts remains uncertain.
What a fast radio burst is
A fast radio burst (FRB) is an extremely brief, intense flash of radio emission from outside our galaxy. Individual bursts last only milliseconds, so the headline’s “10 billion-year-old” describes how long the signal’s light travelled to reach Earth, not how long the flash lasted or how old the galaxy is. Astronomers have detected thousands of these bursts, but most sources have never been identified in visible or infrared light, which is why each localized burst matters.
How the burst was found and located
The Meer Transient Advanced Pipeline (MeerTRAP) team detected FRB 20240304B with South Africa’s MeerKAT radio telescope on March 4, 2024. Radio observations pinned the burst to a precise position on the sky. The galaxy responsible, however, was too faint for the ground-based searches the team had run, so it could not be identified from the ground.
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The follow-up relied on two Webb instruments:
- NIRCam (Near-Infrared Camera) detected the faint host galaxy at the burst’s location.
- NIRSpec (Near-Infrared Spectrograph) measured the galaxy’s redshift, which fixed its distance and therefore the burst’s cosmic timing.
Those results were released on October 8, 2026, by NASA and ESA (Webb), by the Paris Observatory (PSL), and by the W. M. Keck Observatory and the Max Planck Institute for Radio Astronomy, which covered the radio side of the work. The releases reference a paper in the journal Science; that paper holds the full technical detail and was not reviewed for this article.
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Reading the timeline: two clocks, two meanings
The burst involves two time measures that are easy to conflate. The table separates them.
| Measure | Value | What it describes | Source |
|---|---|---|---|
| Redshift of the host galaxy | 2.148 | A measured quantity from Webb’s NIRSpec observations; it tells how much the galaxy’s light has been stretched by cosmic expansion | NASA/ESA (Webb) and Paris Observatory (PSL), October 8, 2026 |
| Cosmic age at emission | About 3 billion years after the Big Bang | How old the universe was when the burst occurred, inferred from the redshift | NASA/ESA (Webb), October 8, 2026 |
| Lookback time | More than 10.7 billion years | How long the burst’s light travelled before reaching Earth | Paris Observatory (PSL), October 8, 2026 |
| Burst duration | Milliseconds | The length of the radio flash itself | Standard FRB observations; the releases describe the burst as millisecond-scale |
In short, the signal left its source about 10.7 billion years ago and arrived after a journey that long, while the universe was roughly a quarter of its current age at the time of emission.
What the host galaxy tells astronomers
The host is a small, actively star-forming dwarf galaxy. NASA and ESA report that it is roughly 1,000 times less massive than the typical host galaxies astronomers had expected for fast radio bursts, based on the team’s comparison with those hosts. That combination of low mass and vigorous star formation points toward a young source.
Two explanations have been the leading candidates for many bursts. The table compares them for this event.
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| Hypothesis | Expected delay after star formation | Fit to the FRB 20240304B host |
|---|---|---|
| Young magnetar (a highly magnetized neutron star formed in a massive star’s supernova) | Prompt, because the source forms soon after its progenitor star | Favored: the host is young and actively forming stars |
| Merger of two neutron stars | Expected to take billions of years after star formation | Judged very unlikely for this burst by the study’s lead author |
The lead author, Manisha Caleb of the University of Sydney, said in the ESA/Webb release: “Our work suggests that it’s very unlikely that this FRB was produced by a merger.” That is the team’s interpretation of this one event. It does not establish a single cause for all fast radio bursts, and the releases do not say how typical hosts for other bursts compare with this one.
A signal that maps the cosmic web
The burst’s light did more than carry a message about its source. As it passed through intervening matter, it picked up imprints of that material. The team reported signatures from a previously unknown galaxy cluster at redshift 0.3, about 3.5 billion light-years away, and from the nearby Virgo Cluster, about 54 million light-years away, according to NASA and ESA.
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J. Xavier Prochaska of the University of California, Santa Cruz, a co-author, described the principle in a NASA quote: “A fast radio burst is almost like a cosmic flashlight. It lights up everything along the path. It carries an imprint of everything that it travels through, so you can use it to trace the ‘cosmic web’ – the otherwise invisible matter and structures that it encounters along the way.” This is the more durable lesson of the result: localized bursts can help map matter that is hard to see directly.
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What remains uncertain
Fast radio bursts have many candidate origins, and the study examines one burst. The host’s youth and low mass make a magnetar the better-supported explanation for FRB 20240304B, and the authors argue against a neutron-star merger. Whether other bursts share that origin, or come from different mechanisms, is not settled by this result. Astronomers will need more localized bursts, each with a host identified and measured, before they can compare populations with confidence.
Readers should also know what is out of reach. Detecting this burst and identifying its host required professional radio and space observatories, and nothing in the reported work suggests that consumer telescopes or radio receivers could observe FRB 20240304B.
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