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Download fileGRB 021004 modelled by multiple energy injections
journal contribution
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. TristramGRB 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 $M_{B}\simeq-22.0$.
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Citation
Astronomy & Astrophysics, 2005, 443 (3), pp. 841-849Version
- VoR (Version of Record)
