The Longest GRB Ever Detected Is An Intriguing Puzzle

In this image, a stellar-mass black hole is eating its stellar companion. This is one potential explanation for an exotic gamma-ray burst detected in July, 2025 that lasted for seven hours. As the black hole entered the star, it consumed stellar material rapidly, emitting powerful gamma-rays. Image Credit: NASA/LSU/Brian Monroe

In July 2025, telescopes detected a gamma-ray burst (GRB) that lasted seven hours. Most GRBs last only milliseconds, or a few minutes. Only a handful have lasted longer than that, and July’s GRB was the longest ever detected. It hints at a new, exotic type of explosive event, and astronomers have a few candidates.

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