The observed afterglows of gamma-ray bursts (GRBs), in particular the afterglow of GRB 970228 after 6 months, seem to rule out, as the origin of GRBs, relativistic fireballs driven by the mergers or accretion-induced collapse of compact stellar objects in galaxies. GRBs can be produced by superluminal jets from such events.
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Arnon Dar (1998) studied this question.
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