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How MeerKAT and Webb Traced a Record-Distant Fast Radio Burst
MeerKAT detected FRB 20240304B on March 4, 2024; Webb identified its host at redshift 2.148, from a time when the universe was about 3 billion years old.
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- MeerKAT detected FRB 20240304B on March 4, 2024; Webb identified its host at redshift 2.148, from a time when the universe was about 3 billion years old.
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openai.comCreate a landscape editorial hero image for this Studio Global article: How did astronomers use MeerKAT and the MeerTRAP project’s March 4, 2024 detection and precise localization of the millisecond-long FRB 2024. Article summary: MeerTRAP detected FRB 20240304B with South Africa’s MeerKAT array on March 4, 2024, and localized the millisecond burst well enough to search for its host. Webb ultimately identified a faint, star-forming dwarf galaxy at. Topic tags: general, government, academic, general web. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts w
A brief radio flash detected by MeerKAT has become a window into the early universe. The MeerTRAP system caught FRB 20240304B on March 4, 2024, and James Webb Space Telescope observations later identified its faint host galaxy. Spectroscopy placed the galaxy at redshift 2.148, meaning the burst came from when the universe was about 3 billion years old.1
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From radio detection to a host galaxy
Fast radio bursts are short flashes of radio emission. MeerKAT detected this one and helped establish its position on the sky. That localization gave astronomers a target for follow-up observations: Webb’s Near-Infrared Camera revealed a small, actively star-forming dwarf galaxy at the burst’s location.2
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Finding a plausible galaxy was not enough to measure the burst’s distance. Webb’s observations of light from oxygen and nitrogen allowed astronomers to determine the galaxy’s redshift and confirm its place in the early universe.1 Because the burst’s host could be identified, FRB 20240304B became the most distant localized fast radio burst reported in the available sources.
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What the distance tells us
A redshift of 2.148 places the source at a time when the universe was roughly 3 billion years old. The burst’s signal has been travelling to Earth for about 11 billion years, according to the study’s account of the discovery.1
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6 The result extends the reach of localized FRB observations and offers astronomers a way to study matter between distant galaxies.
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The burst’s sightline also passes through the Virgo Cluster and a foreground galaxy group. The study uses this line of sight to examine intervening matter and magnetic-field structure; those foreground clues are distinct from the Webb spectrum used to measure the host galaxy’s redshift.4
What may power the burst—and what remains uncertain
The host is described as a low-mass, clumpy, star-forming dwarf galaxy.2
4 Such an environment is consistent with the possibility that a young magnetar—a highly magnetized neutron star—produced the burst. That is a proposed explanation, not a direct identification of the source: the origin of FRBs remains uncertain.
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The key advance is the combination of radio localization and infrared follow-up. MeerKAT narrowed down where the flash came from; Webb found the faint galaxy and measured its redshift. Together, those observations traced a millisecond-long signal back to a much earlier era of cosmic history.
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MeerKAT detected FRB 20240304B on March 4, 2024; Webb identified its host at redshift 2.148, from a time when the universe was about 3 billion years old.