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Title: GRB 021004 modelled by multiple energy injections
Authors: De Ugarte Postigo A
Castro-Tirado, A. J.
Gorosabel, J.
Guzyi, S.
Jelínek, M.
Jóhannesson, G.
Björnsson, G.
Gudmundsson, E. H.
Bremer, M.
Pak, S.
Tanvir, N.
Cerón, J. M. C.
Guzyi, S.
Klose, S.
Pérez-Ramírez, D.
Aceituno, J.
Cardiel, N.
Thiele, U.
Bagatín, A. C.
Covino, S.
Malesani, D.
Ghisellini, G.
Stefanon, M.
Fathkullin, T.
Sokolov, V.
Henden, A. A.
Huferath, S.
Wisotzki, L.
Kurata, Y.
Mannucci, F.
Hunt, L.
Ruiz-Lapuente, P.
Antonelli, L. A.
Di Paola A
Testa, V.
Bartolini, C.
Guarnieri, A.
Piccioni, A.
Boattini, A.
Pizzichini, G.
Masetti, N.
Palazzi, E.
Del Principe M
Fugazza, D.
Konstantinova, T.
Pian, E.
Tristram, P. J.
First Published: Dec-2005
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2005, 443 (3), pp. 841-849
Abstract: GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present 107 new optical, near-infrared (NIR) and millimetre observations, ranging from 2 h to more than a year after the burst. Fitting the multiband data to a model based on multiple energy injections suggests that at least 7 refreshed shocks took place during the evolution of the afterglow, implying a total energy release (collimated within an angle of 1$\fdg$8) of ~ $8 \times 10^{51}$ erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction ( $A_{\rm V}\sim0.1$) starburst galaxy with $M_{B}\simeq-22.0$.
DOI Link: 10.1051/0004-6361:20052898
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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