Summary

Gamma-ray bursts (GRBs) are among the most energetic cosmic events since the Big Bang, releasing the most energetic type of radiation, gamma rays – the stuff that turned unassuming Bruce Banner into the rampaging Hulk, but on an astronomical, potentially planet-sterilizing level. GRBs are classed by transience, including short-duration ones that last less than two seconds and long-duration ones that last over two seconds ( possibly much longer ).

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