NASA and ESA reported on October 8, 2026 that the James Webb Space Telescope has identified the host galaxy of FRB 20240304B, the most distant fast radio burst (FRB) seen to date. The burst has a redshift of 2.148, placing it roughly 3 billion years after the Big Bang. The host is a small, actively star-forming dwarf galaxy, and its properties make a young magnetar a more plausible source for this particular burst than a merger of two neutron stars. The finding does not settle what produces FRBs in general.
How the burst was found and then located
Fast radio bursts are millisecond-scale flashes of radio emission from far outside the Milky Way. The MeerTRAP team detected FRB 20240304B with the MeerKAT radio telescope on March 4, 2024. The radio data pinned down the burst’s position precisely and suggested it came from an extreme distance, but ground-based telescopes could not find a galaxy at that spot. Webb supplied the missing identification in three steps:
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- MeerKAT localized the burst to a precise sky position.
- Webb’s NIRCam (near-infrared camera) detected a galaxy at that position.
- Webb’s NIRSpec (near-infrared spectrograph) measured the galaxy’s spectrum and returned a redshift of 2.148.
Without the first step, there would have been no position to examine. Without the last, the galaxy would have been a candidate rather than a confirmed host.
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Redshift measures how much the light from a source has been stretched by the expansion of the universe, so a higher value means a more distant, more ancient source. NASA and ESA translate the value of 2.148 into cosmic time: the burst occurred when the universe was about 3 billion years old. Their 2026 releases describe distance in that cosmic-age framing and do not give a present-day distance in light-years for the host, so that figure should not be taken from secondary coverage.
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The host galaxy is small and unexpectedly active
The host is a dwarf galaxy that is still forming stars. According to NASA and ESA, it is roughly 1,000 times less massive than researchers expected based on other known FRB host galaxies. Its star-formation rate suggests that most of its stars may have formed within about 30 million years. Ben Stappers of the University of Manchester, a co-author, put it this way: “The host sticks out in the whole galaxy sample that we have. And it definitely was not what we were expecting.”
Magnetar or neutron-star merger?
Two leading proposals for FRB origins differ in timing, and the host’s age profile is what helps separate them.
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| Proposed source | Expected stellar age of host | Fit with this host |
|---|---|---|
| Merger of two neutron stars | Older population, because orbital decay takes billions of years | Less natural for a host still forming stars |
| Young, highly magnetic neutron star (magnetar) formed in a massive star’s supernova | Young population; the burst can occur relatively soon after the magnetar forms | Consistent with a young, star-forming host |
Lead author Manisha Caleb of the University of Sydney said, “Our work suggests that it’s very unlikely that this FRB was produced by a merger.” The result applies to this burst. It is not evidence that every FRB comes from a magnetar.
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A signal that maps the path to Earth
FRB radio signals are dispersed by free electrons in the plasma they pass through, so the signal carries information about matter that is hard to observe directly. This burst’s path crosses a previously unknown galaxy cluster at redshift 0.3, about 3.5 billion light-years away, and the nearby Virgo Cluster, about 54 million light-years away. J. Xavier Prochaska of the University of California, Santa Cruz, a co-author, described the method: “A fast radio burst is almost like a cosmic flashlight. It lights up everything along the path.” Each of these distances comes from the NASA and ESA release of October 8, 2026.
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Why the record changed
Older articles that call FRB 20220610A the most distant fast radio burst were accurate when they were published. That burst was detected in June 2022 and reported in 2023 in a Science paper. The table below shows how the two records compare.
| Detail | FRB 20220610A | FRB 20240304B |
|---|---|---|
| Detection | June 2022 | March 4, 2024 (MeerKAT) |
| Publication of distance record | 2023, Science paper | October 8, 2026, NASA and ESA releases |
| Redshift | 1.016 ± 0.002 | 2.148 |
| Status as of October 2026 | Former record | Most distant FRB reported to date |
What is still unknown
The mechanism behind FRBs remains uncertain. Caleb put it plainly: “What makes fast radio bursts interesting is that we don’t know what generates them. We have theories for what objects produce them, but we don’t have conclusive proof.” This single host strengthens the case for one kind of source in one case. It does not establish the origin of the FRB population as a whole. ESA’s accompanying journal article was not available for this report, so the specifics above come from the NASA and ESA institutional releases dated October 8, 2026.
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Bottom line
Webb has identified the host of the most distant fast radio burst reported so far. The galaxy sits about 3 billion years after the Big Bang, is small and star-forming, and points toward a magnetar rather than a neutron-star merger for this burst. The same signal also maps intervening matter, but the origin of FRBs in general is still open.
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