De Pasquale, M., Page, M. J., Kann, D. A., Oates, S. R., Schulze, S., Zhang, B., Cano, Z., Gendre, B., Malesani, D., Rossi, A., Troja, E., Piro, L., Boer, M., Stratta, G. and Gehrels, N. (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. doi:10.1093/mnras/stw1704 ISSN 0035-8711.

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Abstract

GRB 130427A was the brightest gamma-ray burst detected in the last 30 yr. With an equivalent isotropic energy output of 8.5 × 1053 erg and redshift z = 0.34, it uniquely combined very high energetics with a relative proximity to Earth. As a consequence, its X-ray afterglow has been detected by sensitive X-ray observatories such as XMM–Newton and Chandra for a record-breaking baseline longer than 80 million seconds. We present the X-ray light curve of this event over such an interval. The light curve shows a simple power-law decay with a slope α = 1.309 ± 0.007 over more than three decades in time (47 ks–83 Ms). We discuss the consequences of this result for a few models proposed so far to interpret GRB 130427A, and more in general the significance of this outcome in the context of the standard forward shock model. We find that this model has difficulty in explaining our data, in both cases of constant density and stellar-wind circumburst media, and requires far-fetched values for the physical parameters involved.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Gamma ray bursts
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	0035-8711
Official Date:	11 October 2016
Dates:	Date Event 11 October 2016 Published 15 July 2016 Available 13 July 2016 Accepted 13 July 2016 Submitted
Volume:	462
Number:	1
Page Range:	pp. 1111-1122
DOI:	10.1093/mnras/stw1704
Status:	Peer Reviewed
Publication Status:	Published
Date of first compliant deposit:	12 January 2017
Date of first compliant Open Access:	12 January 2017
Funder:	Istituto nazionale di astrofisica (Italy) (INAF), United States. National Aeronautics and Space Administration (NASA), France. Agence nationale de la recherche (ANR), Karl-Schwarzschild-Observatorium, Instrumentcenter for Dansk Astrofysik [Instrument Centre for Danish Astrophsics] (IDA), Italy. Ministero dell'istruzione, dell'università e della ricerca (MIUR), UK Space Agency (UKSA), The Spanish Research Project (SRP), Rannsóknaráð ríkisins (Iceland)
Grant number:	PRIN-INAF 2012/13, Premiale LBT 2013 (INAF), NNX13AD28A, NNX15AP95A (NASA), programme ANR-14- CE33 (ANR), FIRB 2012 RBFR12PM1F (MIUR), AYA2012-39727-C03-01 (SRP)
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