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Detailed multiwavelength modelling of the dark GRB 140713A and its host galaxy

Higgins, AB, Van Der Horst, AJ, Starling, RLC, Anderson, G, Perley, DA, Van Eerten, H, Wiersema, K, Jakobsson, P, Kouveliotou, C, Lamb, GP and Tanvir, NR (2019) Detailed multiwavelength modelling of the dark GRB 140713A and its host galaxy. Monthly Notices of the Royal Astronomical Society, 484 (4). pp. 5245-5255. ISSN 0035-8711

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Abstract

We investigate the afterglow of GRB 140713A, a gamma-ray burst (GRB) that was detected and relatively well sampled at X-ray and radio wavelengths, but was not present at optical and near-infrared wavelengths, despite searches to deep limits. We present the emission spectrum of the likely host galaxy at z = 0.935 ruling out a high-redshift explanation for the absence of the optical flux detection. Modelling the GRB multiwavelength afterglow using the radiative transfer hydrodynamics code boxfit provides constraints on physical parameters of the GRB jet and its environment, for instance a relatively wide jet opening angle and an electron energy distribution slope p below 2. Most importantly, the model predicts an optical flux about two orders of magnitude above the observed limits. We calculated that the required host extinction to explain the observed limits in the r, i, and z bands was A rm host-V gt 3.2 mag, equivalent to E(B ' V) host > 1.0 mag. From the X-ray absorption we derive that the GRB host extinction is A rm host-V = 11.6 +7.5-5.3 mag, equivalent to E(B-V) rm host = 3.7 +2.4-1.7 mag, which is consistent with the extinction required from our boxfit derived fluxes. We conclude that the origin of the optical darkness is a high level of extinction in the line of sight to the GRB, most likely within the GRB host galaxy. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 26 Mar 2019 10:31
Last Modified: 26 Mar 2019 10:36
DOI or Identification number: 10.1093/mnras/stz384
URI: http://researchonline.ljmu.ac.uk/id/eprint/10413

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