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

Journal
Date Issued
2018
Author(s)
•
Guetta, D.
•
•
•
•
Branchesi, M.
•
•
Izzo, L.
•
Perez-Torres, M. A.
•
DOI
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∼ 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 short gamma-ray 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.
Volume
481
Issue
4
Start page
4355
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.481.4355D
Rights
open.access
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