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Low-{Gamma} jets from Compact Binary Mergers as Candidate Electromagnetic Counterparts to Gravitational Wave Sources
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Low-{Gamma} jets from Compact Binary Mergers as Candidate Electromagnetic Counterparts to Gravitational Wave Sources
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Compact binary mergers, with neutron stars or neutron star and black-hole components, are thought to produce various electromagnetic counterparts: short gamma-ray bursts (GRBs) from ultra-relativistic jets followed by broadband afterglow; semi-isotropic kilonova from radioactive decay of r-process elements; and late time radio flares; etc. If the jets from such mergers follow a similar power-law distribution of Lorentz factors as other astrophysical jets then the population of merger jets will be dominated by low-{\Gamma} values. The prompt gamma-rays associated with short GRBs would be suppressed for a low-{\Gamma} jet and the jet energy will be released as X-ray/optical/radio transients when a shock forms in the ambient medium. Using Monte Carlo simulations, we study the properties of such transients as candidate electromagnetic counterparts to gravitational wave sources detectable by LIGO/Virgo. Approximately 78% of merger-jets result in failed GRB with optical peaks 14-22 magnitude and an all-sky rate of 2-3 per year.
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