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Title: An unexpectedly rapid decline in the X-ray afterglow emission of long gamma-ray bursts
Authors: Tagliaferri, Gianpiero
Goad, Michael R.
Chincarini, Guido
Moretti, Alberto
Campana, Sergio
Burrows, David N.
Perri, M.
Barthelmy, Scott D.
Gehrels, Neil
Krimm, H.
Sakamoto, Takanori
Kumar, P.
Meszaros, P.I.
Kobayashi, Shiho
Zhang, B.
Angelini, Lorella
Banat, P.L.
Beardmore, Andrew P.
Capalbi, M.
Covino, S.
Cusumano, Giancarlo
Godet, Olivier
Hill, Joanne E.
Kennea, Jamie A.
Mangano, V.
Morris, David C.
Nousek, John A.
O'Brien, Paul T.
Osborne, Julian P.
Pagani, Claudio
Page, Kim L.
Romano, Patrizia
Stella, L.
Wells, Alan A.
First Published: 2005
Publisher: Nature Publishing Group
Citation: Nature, 2005, 436 (7053), pp.985-988.
Abstract: ‘Long’ γ-ray bursts (GRBs) are commonly accepted to originate in the explosion of particularly massive stars, which give rise to highly relativistic jets. Inhomogeneities in the expanding flow result in internal shock waves that are believed to produce the γ-rays we see. As the jet travels further outward into the surrounding circumstellar medium, ‘external’ shocks create the afterglow emission seen in the X-ray, optical and radio bands. Here we report observations of the early phases of the X-ray emission of five GRBs. Their X-ray light curves are characterised by a surprisingly rapid fall-off for the first few hundred seconds, followed by a less rapid decline lasting several hours. This steep decline, together with detailed spectral properties of two particular bursts, shows that violent shock interactions take place in the early jet outflows.
DOI Link: 10.1038/nature03934
ISSN: 0028-0836
eISSN: 1476-4687
Type: Article
Rights: © 2005 Nature Publishing Group
Description: Full text not available from the LRA.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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