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

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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 RKN ~ 352 -281+810 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 -1220+3200 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 short gammaray bursts (sGRB)/KN events or the sGRBs associated with BNS mergers are beamed and observable under viewing angles as large as θ ≲40°. 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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APA

Della Valle, M., Guetta, D., Cappellaro, E., Amati, L., Botticella, M. T., Branchesi, M., … Stratta, G. (2018). GW170817: Implications for the local kilonova rate and for surveys from ground-based facilities. Monthly Notices of the Royal Astronomical Society, 481(4), 4355–4360. https://doi.org/10.1093/mnras/sty2541

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