GRB 021004 modelled by multiple energy injections

A. de Ugarte Postigo , A.J. Castro-Tirado , J. Gorosabel , G. J\'ohannesson , G. Bjornsson , E.H. Gudmundsson , M. Bremer , S. Pak

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N. Tanvir J.M. Castro Cer\'on S. Guzyi M. Jel\'inek S. Klose D. P\'erez-Ram\'irez J. Aceituno A. Campo Bagat\'in 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

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classification 🌌 astro-ph

keywords energyinjectionsmultipleafterglowalthoughamountanalysisangle

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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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GRB 021004 modelled by multiple energy injections

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