A burst of gamma rays, the most energetic form of light, reached Earth on 5 October 2026 and was recorded by three separate space telescopes: Fermi, Glowbug (an experiment on the International Space Station) and China's GECAM-B. Fermi places it in the constellation region around 22h 39m right ascension and +5.5 degrees declination, but only roughly, with an uncertainty of about 6 degrees. Fermi classed it as a likely long burst, the kind usually linked to the collapse of a massive star. Glowbug measured a single peak lasting about 5 seconds, and GECAM-B estimated about 9 seconds with a large margin of error. No distance, afterglow or visible-light counterpart has been reported so far.

How unusual is it? This is a typical single-pulse long gamma-ray burst, of a kind Fermi and Swift see a few hundred times a year, with only a rough location and no distance or afterglow reported. A measured distance or a detected afterglow would make it notable.

Written by an AI model (claude-sonnet-5-5) from the official reports in this thread, and rewritten as new reports arrived (version 2); last updated 10/8/2026 12:22:50 PM. It may contain mistakes: the reports themselves are the authority.