arXiv · astro-ph/0506544
GRB 021004 modelled by multiple energy injections
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 a large amount (107) of new optical, near-infrared (NIR) and millimetre observations, ranging from 2 hours 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 1.8 deg) of ~ 8x10^51 erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction (Av ~ 0.1) starburst galaxy with M_B ~ -22.0.
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A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel, G. Jóhannesson, G. Bjornsson, E. H. Gudmundsson, M. Bremer, S. Pak, N. Tanvir, J. M. Castro Cerón, S. Guzyi, M. Jelínek, S. Klose, D. Pérez-Ramírez, J. Aceituno, A. Campo Bagatín, S. Covino, N. Cardiel, T. Fathkullin, A. A. Henden, S. Huferath, Y. Kurata, D. Malesani, F. Mannucci, P. Ruiz-Lapuente, V. Sokolov, U. Thiele, L. Wisotzki, L. A. Antonelli, C. Bartolini, A. Boattini, A. Guarnieri, A. Piccioni, G. Pizzichini, M. del Principe, A. di Paola, D. Fugazza, G. Ghisellini, L. Hunt, T. Konstantinova, N. Masetti, E. Palazzi, E. Pian, M. Stefanon, V. Testa, P. J. Tristram. 2005-06-22. GRB 021004 modelled by multiple energy injections. https://doi.org/10.1051/0004-6361%3A20052898
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