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GRB 110715A: The peculiar multiwavelength evolution of the first afterglow detected by ALMA

Sánchez-Ramírez, R and Hancock, PJ and Jóhannesson, G and Murphy, T and de Ugarte Postigo, A and Gorosabel, J and Kann, DA and Krühler, T and Oates, SR and Japelj, J and Thöne, CC and Lundgren, A and Perley, DA and Malesani, D and de Gregorio Monsalvo, I and Castro-Tirado, AJ and D'Elia, V and Fynbo, JPU and Garcia-Appadoo, D and Goldoni, P and Greiner, J and Hu, YD and Jelínek, M and Jeong, S and Kamble, A and Klose, S and Kuin, NPM and Llorente, A and Martín, S and Nicuesa Guelbenzu, A and Rossi, A and Schady, P and Sparre, M and Sudilovsky, V and Tello, JC and Updike, A and Wiersema, K and Zhang, BB (2017) GRB 110715A: The peculiar multiwavelength evolution of the first afterglow detected by ALMA. Monthly Notices of the Royal Astronomical Society, 464 (4). pp. 4624-4640. ISSN 0035-8711

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Abstract

We present the extensive follow-up campaign on the afterglowof GRB 110715A at 17 different wavelengths, from X-ray to radio bands, starting 81 s after the burst and extending up to 74 d later.We performed for the first time aGRBafterglowobservationwith theALMAobservatory. We find that the afterglow of GRB 110715A is very bright at optical and radio wavelengths. We use the optical and near-infrared spectroscopy to provide further information about the progenitor's environment and its host galaxy. The spectrum shows weak absorption features at a redshift z = 0.8225, which reveal a host-galaxy environment with low ionization, column density, and dynamical activity. Late deep imaging shows a very faint galaxy, consistent with the spectroscopic results. The broad-band afterglow emission is modelled with synchrotron radiation using a numerical algorithm and we determine the best-fitting parameters using Bayesian inference in order to constrain the physical parameters of the jet and the medium in which the relativistic shock propagates. We fitted our data with a variety of models, including different density profiles and energy injections. Although the general behaviour can be roughly described by thesemodels, none of them are able to fully explain all data points simultaneously. GRB 110715A shows the complexity of reproducing extensive multiwavelength broad-band afterglow observations, and the need of good sampling in wavelength and time and more complex models to accurately constrain the physics of GRB afterglows. © 2016 The Authors. 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 ©: 2016 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: 24 May 2017 08:52
Last Modified: 06 Sep 2017 18:21
DOI or Identification number: 10.1093/mnras/stw2608
URI: http://researchonline.ljmu.ac.uk/id/eprint/6564

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