The Delay Time of Gravitational Wave -- Gamma-Ray Burst Associations

Abstract

The first gravitational wave (GW) - gamma-ray burst (GRB) association, GW170817/GRB 170817A, had an offset in time, with the GRB trigger time delayed by $\sim$1.7 s with respect to the merger time of the GW signal. We generally discuss the astrophysical origin of the delay time, $\Delta t$, of GW-GRB associations within the context of compact binary coalescence (CBC) -- short GRB (sGRB) associations and GW burst -- long GRB (lGRB) associations. In general, the delay time should include three terms, the time to launch a clean (relativistic) jet, $\Delta t_{\mathrm{jet}}$; the time for the jet to break out from the surrounding medium, $\Delta t_{\mathrm{bo}}$; and the time for the jet to reach the energy dissipation and GRB emission site, $\Delta t_{\mathrm{GRB}}$. For CBC-sGRB associations, $\Delta t_{\mathrm{jet}}$ and $\Delta t_{\mathrm{bo}}$ are correlated, and the final delay can be from 10 ms to a few seconds. For GWB-lGRB associations, $\Delta t_{\mathrm{jet}}$ and $\Delta t_{\mathrm{bo}}$ are independent. The latter is at least $\sim$10 s, so that $\Delta t$ of these associations is at least this long. For certain jet launching mechanisms of lGRBs, $\Delta t$ can be minutes or even hours long due to the extended engine waiting time $\Delta t_{\mathrm{wait}}$ to launch a jet. We discuss the cases of GW170817/GRB 170817A and GW150914/GW150914-GBM within this theoretical framework and suggest that the delay times of future GW/GRB associations will shed light into the jet launching mechanisms of GRBs.

arXiv commentMatch the version published in Frontiers of Physics as a mini-review

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