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GRB 021004 modelled by multiple energy injections

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posted on 2012-10-24, 09:05 authored by De Ugarte Postigo A, A. J. Castro-Tirado, J. Gorosabel, S. Guzyi, M. Jelínek, G. Jóhannesson, G. Björnsson, E. H. Gudmundsson, M. Bremer, S. Pak, N. Tanvir, J. M. C. Cerón, S. Klose, D. Pérez-Ramírez, J. Aceituno, N. Cardiel, U. Thiele, A. C. Bagatín, S. Covino, D. Malesani, G. Ghisellini, M. Stefanon, T. Fathkullin, V. Sokolov, A. A. Henden, S. Huferath, L. Wisotzki, Y. Kurata, F. Mannucci, L. Hunt, P. Ruiz-Lapuente, L. A. Antonelli, Di Paola A, V. Testa, C. Bartolini, A. Guarnieri, A. Piccioni, A. Boattini, G. Pizzichini, N. Masetti, E. Palazzi, Del Principe M, D. Fugazza, T. Konstantinova, E. Pian, P. J. Tristram
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 $M_{B}\simeq-22.0$.

History

Citation

Astronomy & Astrophysics, 2005, 443 (3), pp. 841-849

Version

  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

Copyright date

2005

Available date

2012-10-24

Publisher version

http://www.aanda.org/articles/aa/abs/2005/45/aa2898-05/aa2898-05.html

Language

en

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