The short gamma-ray burst GRB 170817A followed the merger signal by about , providing direct evidence that at least some short gamma-ray bursts arise from neutron star mergers. The association connects their high-energy emission and relativistic outflows to compact-binary coalescence. It does not establish that every short burst has this progenitor, nor that the observed gamma-ray luminosity is independent of viewing angle.[ref]
Multi-messenger Observations of a Binary Neutron Star Merger by LIGO Scientific Collaboration and others. Abstract and multiwavelength counterpart discussion: GRB 170817A delay and association
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