https://arxiv.org/abs/astro-ph/0508332
ARXIV.ORG
Evidence for a Canonical GRB Afterglow Light Curve in the Swift/XRT Data We present new observations of the early X-ray afterglows of the first 27 gamma-ray bursts (GRBs) detected with the Swift X-ray Telescope (XRT). The early X-ray afterglows show a canonical behavior, where the light curve broadly consists of three distinct power law segments: (i) an initial very steep decay (t^{-alpha} with 3
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