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

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

http://hdl.handle.net/20.500.12386/31849

Url

https://academic.oup.com/mnras/article/481/4/4355/5101464?login=true

Issn Identifier

0035-8711

Ads BibCode

2018MNRAS.481.4355D

Rights

open.access

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Description

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Format

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

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