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Nature 416, 484-485 (4 April 2002) | doi:10.1038/416484a
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Astrophysics: The evidence in the afterglow
Herman L. Marshall
Abstract
The X-ray spectrum of an afterglow from a 
-ray burst reveals a smoking gun. It links the -rays to the expanding fireball that occurs after a supernova explosion.
Our understanding of -ray bursts (GRBs) becomes clearer with the new observations by Reeves et al.1 on page 512 of this issue. GRBs are thought to result from the collapse of an extremely massive star to a black hole (prompting a supernova2) or when a neutron star falls into a black hole3.
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