GRB 050509B

astronomy

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July 20, 2026

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GRB 050509B was a gamma-ray burst (GRB) detected on May 9, 2005. Unlike many GRBs originating from distant galaxies, this event occurred in a relatively nearby galaxy, about 2.7 billion light-years away. This proximity meant GRB 050509B was significantly less luminous than typical long-duration GRBs.1

Gamma-ray bursts are intense, unpredictable flashes of high-energy gamma rays that last only seconds. They are among the most distant objects in the universe and are thought to originate from collapsing hypergiant stars or merging neutron stars. The Swift satellite observatory was designed to detect these events and quickly orient its telescopes to observe them across different wavelengths. GRB 050509B's location helped astronomers consider that short bursts might result from the merger of compact objects like neutron stars.21

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…a relatively short-lived gamma-ray burst, GRB 050509B, detected on May 9, 2005. On the basis of its position, this event was shown to have arisen in a relatively nearby galaxy (2.7 billion light-years away), which meant that the luminosity of the event was approximately a thousand times less than those…
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…a relatively short-lived gamma-ray burst, GRB 050509B, detected on May 9, 2005. On the basis of its position, this event was shown to have arisen in a relatively nearby galaxy (2.7 billion light-years away), which meant that the luminosity of the event was approximately a thousand times less than those…
Read More