The X-ray spectrum of an afterglow from a γ-ray burst reveals a smoking gun. It links the γ-rays to the expanding fireball that occurs after a supernova explosion.
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Marshall, H. The evidence in the afterglow. Nature 416, 484–485 (2002). https://doi.org/10.1038/416484a
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DOI: https://doi.org/10.1038/416484a
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