Dying supergiant stars implicated in hours-long gamma-ray bursts
Three unusually long-lasting stellar explosions discovered by NASA's Swift satellite represent a previously unrecognized class of gamma-ray bursts (GRBs). Two international teams of astronomers studying these events conclude that they likely arose from the catastrophic death of supergiant stars hundreds of times larger than the sun.
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GRB 101225A, better known as the "Christmas burst, " was an unusually long-lasting gamma-ray burst. Because its distance ...