http://arxiv.org/abs/1811.08542
Short Gamma-Ray Burst (SGRB) progenitors have long been thought to be coalescing compact system of two Neutron Stars (NSNS) or a Neutron Star and a Black Hole (NSBH). The August 17$^{\rm th}$, 2017 detection of the GW170817 gravitational-wave signal by Advanced LIGO and Advanced Virgo in coincidence with the electromagnetic observation of the SGRB GRB170817A confirmed this scenario and provided new physical information on the nature of these astronomical events. We use SGRB observations by the Neil Gehrels Swift Observatory and GW170817/GRB170817A observational data to estimate the detection rate of coincident gravitational-wave and electromagnetic observations by a gravitational-wave network and constrain the physical parameters of the SGRB jet structure. We estimate the rate of LIGO-Virgo gravitational-wave detections coincident with SGRB electromagnetic detections by the Fermi Gamma-ray Space Telescope to be in the range $\sim$ 0.2 (0.6) to $\sim$ 0.6 (1.7) yr$^{-1}$ at the planned LV network sensitivity in the third (fourth) observing run. Assuming a structured jet model with a uniform ultra-relativistic jet surrounded by a region with power-law decay emission, we find the most likely values for the jet half-opening angle and the power-law exponent to be $\theta_c=10.7\,{}^{\circ}{}^{+6.1\,{}^{\circ}}{-3.3\,{}^{\circ}}$ and $s=9.0^{+7.4}{-2.4}$, respectively.
K. Mogushi, M. Cavaglià and K. Siellez
Thu, 22 Nov 18
38/57
Comments: 25 pages, 10 figures
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