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Title: The prompt-afterglow connection in gamma-ray bursts: a comprehensive statistical analysis of Swift X-ray light curves
Authors: Margutti, R.
Zaninoni, E.
Bernardini, M. G.
Chincarini, G.
Pasotti, F.
Guidorzi, C.
Angelini, L.
Burrows, D. N.
Capalbi, M.
Evans, Phil A.
Gehrels, N.
Kennea, J.
Mangano, V.
Moretti, A.
Nousek, J.
Osborne, Julian Paul
Page, Kim L.
Perri, M.
Racusin, J.
Romano, P.
Sbarufatti, B.
Stafford, S.
Stamatikos, M.
First Published: 25-Oct-2012
Publisher: Oxford University Press (OUP)
Citation: Monthly Notices Of The Royal Astronomical Society, 2013, 428 (1), pp. 729-742 (14)
Abstract: We present a comprehensive statistical analysis of Swift X-ray light curves of gamma-ray bursts (GRBs) collecting data from more than 650 GRBs discovered by Swift and other facilities. The unprecedented sample size allows us to constrain the rest-frame X-ray properties of GRBs from a statistical perspective, with particular reference to intrinsic time-scales and the energetics of the different light-curve phases in a common rest-frame 0.3–30 keV energy band. Temporal variability episodes are also studied and their properties constrained. Two fundamental questions drive this effort: (i) Does the X-ray emission retain any kind of ‘memory’ of the prompt γ-ray phase? (ii) Where is the dividing line between long and short GRB X-ray properties? We show that short GRBs decay faster, are less luminous and less energetic than long GRBs in the X-rays, but are interestingly characterized by similar intrinsic absorption. We furthermore reveal the existence of a number of statistically significant relations that link the X-ray to prompt γ-ray parameters in long GRBs; short GRBs are outliers of the majority of these two-parameter relations. However and more importantly, we report on the existence of a universal three-parameter scaling that links the X-ray and the γ-ray energy to the prompt spectral peak energy of both long and short GRBs: EX, iso∝E[Superscript: 1.00 ± 0.06]γ, iso/E[Superscript: 0.60 ± 0.10]pk.
DOI Link: 10.1093/mnras/sts066
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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