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GRB Precursors in the Fallback Collapsar Scenario

GRB Precursors in the Fallback Collapsar Scenario

Precursor emission has been observed in a nonnegligible fraction of gamma-ray bursts. The time gap between the precursor and the main burst extends in some cases up to hundreds of seconds. Both the origins of the precursor and the large value of the time gap are controversial. Here we investigate …