There are two types of gamma-ray bursts: short and long. The short GRBs last a very short duration, a maximum of two seconds but sometimes even less. The longer ones are still relatively short, coming in at more than two seconds and sometimes several minutes, with the longest ones typically clocking in between 20 seconds and 50 seconds. A rare type of long GRB has been seen in action a couple times throughout recent years, however, and scientists finally have an answer about what causes them.
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