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GRB 170817A as a jet counterpart to gravitational wave trigger GW 170817

Lamb, GP and Kobayashi, S (2018) GRB 170817A as a jet counterpart to gravitational wave trigger GW 170817. Monthly Notices of the Royal Astronomical Society, 487 (1). pp. 733-740. ISSN 0035-8711

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Abstract

Fermi/GBM (Gamma-ray Burst Monitor) and INTEGRAL (the International Gamma-ray Astrophysics Laboratory) reported the detection of the γ-ray counterpart, GRB 170817A, to the LIGO (Light Interferometer Gravitational-wave Observatory)/Virgo gravitational wave detected binary neutron star merger, GW 170817. GRB 170817A is likely to have an internal jet or another origin such as cocoon emission, shock-breakout, or a flare from a viscous disc. In this paper we assume that the γ-ray emission is caused by energy dissipation within a relativistic jet and we model the afterglow synchrotron emission from a reverse and forward shock in the outflow. We show the afterglow for a low-luminosity γ-ray burst (GRB) jet with a high Lorentz factor (Γ); a low-Γ and low-kinetic-energy jet; a low-Γ, high-kinetic-energy jet; structured jets viewed at an inclination within the jet-half-opening angle; and an off-axis ‘typical’ GRB jet. All jet models will produce observable afterglows on various time-scales. The late-time afterglow from  10 to 110 d can be fitted by a Gaussian structured jet viewed at a moderate inclination, however the GRB is not directly reproduced by this model. These jet afterglow models can be used for future gravitational wave detected neutron star merger counterparts with a jet afterglow origin.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.HE; astro-ph.HE; gr-qc
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 22 May 2018 08:46
Last Modified: 15 Jun 2018 10:27
DOI or Identification number: 10.1093/mnras/sty1108
URI: http://researchonline.ljmu.ac.uk/id/eprint/8687

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