Astronomers have spotted a cosmic explosion of high-energy gamma-rays unlike any ever seen before. The gamma-ray burst (GRB) designated GRB 250702B set itself apart from other explosive bursts of gamma-rays by exploding several times in one day.

That's something difficult to explain, given GRBs are thought to arise from the catastrophic deaths of massive stars, with no known scenario currently accounting for repeated blasts over a full day. Co-lead researcher and University College Dublin astronomer, Antonio Martin-Carrillo, said in a statement that this GRB is "unlike any other seen in 50 years of GRB observations."

GRB 250702B was initially detected by NASA's Fermi Gamma-ray Space Telescope on July 2, 2025, but its location was uncertain. The following day, GRB 250702B was investigated

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