De Pasquale, M;
Page, MJ;
Kann, DA;
Oates, SR;
Schulze, S;
Zhang, B;
Cano, Z;
... Gehrels, N; + view all
(2016)
The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model.
Monthly Notices of the Royal Astronomical Society
, 462
(1)
pp. 1111-1122.
10.1093/mnras/stw1704.
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Abstract
GRB 130427A was the brightest gamma-ray burst detected in the last 30 yr. With an equivalentisotropic energy output of 8.5 × 1053 erg and redshift z = 0.34, it uniquely combined veryhigh energetics with a relative proximity to Earth. As a consequence, its X-ray afterglowhas been detected by sensitive X-ray observatories such as XMM-Newton and Chandra fora record-breaking baseline longer than 80 million seconds. We present the X-ray light curveof this event over such an interval. The light curve shows a simple power-law decay with aslope α = 1.309 ± 0.007 over more than three decades in time (47 ks-83 Ms). We discuss theconsequences of this result for a few models proposed so far to interpret GRB 130427A, andmore in general the significance of this outcome in the context of the standard forward shockmodel. We find that this model has difficulty in explaining our data, in both cases of constantdensity and stellar-wind circumburst media, and requires far-fetched values for the physicalparameters involved.
| Type: | Article |
|---|---|
| Title: | The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw1704 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stw1704 |
| Language: | English |
| Additional information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, copyright © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Keywords: | gamma-ray burst: general; gamma-ray burst: individual: GRB 130427A |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1535278 |
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