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Fig. 1

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Gamma-ray light curves of the two prompt episodes of GRB 121217A (Peak 1 and 2) acquired with BAT (15 − 150  keV) and GBM (8 − 1000  keV). The GBM triggered on the second peak, which occurs at a time of T0 + 735 s, but has been shifted in this plot to coincide with the BAT T0. Both light curves have been binned in time with a moving box of 5 s. There is extra emission seen before and after the second peak (3a, 3b, 3c, 3d, and 3e). The corresponding times and instrument detections are noted in Table 1.

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