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We present the systematic analysis of the Ultraviolet/Optical Telescope (UVOT) and X‐ray Telescope (XRT) light curves for a sample of 26 Swift gamma‐ray bursts (GRBs). By comparing the optical/UV and X‐ray light curves, we found that they are remarkably different during the first 500 s after the Burst Alert Telescope trigger, while they become more similar during the middle phase of the afterglow,...
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