Detailed multi-wavelength modelling of the dark GRB 140713A and its host galaxy

Adam Higgins, Alexander van der Horst, Rhaana Starling, Gemma Anderson, D. A. Perley, Hendrik Van Eerten, K. Wiersema, P. Jakobsson, C. Kouveliotou, Gavin P. Lamb, Nial R. Tanvir

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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.

Original languageEnglish
Pages (from-to)5245-5255
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume484
Issue number4
Early online date7 Feb 2019
DOIs
Publication statusPublished - 21 Apr 2019

Keywords

  • gamma-ray burst: individual: GRB140713A

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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