Stars are exploding two, three, and sometimes four times in the first minutes following the initial explosion, ... First comes a blast of gamma-rays followed by intense pulses of X-rays. The energies involved are much greater than anyone expected.
This was a massive star that lived fast and died young. This star was probably quite different from the kind we see today, the type that only could have existed in the early universe.
This was a massive star that lived fast and died young.