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arXiv · 1809.04295

GW170817: implications for the local kilonova rate and for surveys from ground-based facilities

M. Della Valle·D. Guetta·E. Cappellaro·L. Amati·M. T. Botticella·M. Branchesi·E. Brocato·L. Izzo·M. A. Perez-Torres·G. Stratta
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Abstract

We compute the local rate of events similar to GRB 170817A, which has been recently found to be associated with a kilonova (KN) outburst. Our analysis finds an observed rate of such events of R$_{KN}\sim 352^{+810}_{-281}$ Gpc$^{-3}$yr$^{-1}$. After comparing at their face values this density of sGRB outbursts with the much higher density of Binary Neutron Star (BNS) mergers of 1540$^{+3200}_{-1220}$ Gpc$^{-3}$yr$^{-1}$, estimated by LIGO-Virgo collaboration, one can conclude, admittedly with large uncertainty that either only a minor fraction of BNS mergers produces sGRB/KN events or the sGRBs associated with BNS mergers are beamed and observable under viewing angles as large as $\theta$ $\leq$ $40^{\circ}$. Finally we provide preliminary estimates of the number of sGRB/KN events detected by future surveys carried out with present/future ground-based/space facilities, such as LSST, VST, ZTF, SKA and THESEUS.

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M. Della Valle, D. Guetta, E. Cappellaro, L. Amati, M. T. Botticella, M. Branchesi, E. Brocato, L. Izzo, M. A. Perez-Torres, G. Stratta. 2018-09-12. GW170817: implications for the local kilonova rate and for surveys from ground-based facilities. https://doi.org/10.1093/mnras/sty2541

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