2026-06-30T01:23:02Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/513332023-08-28T03:04:33Zcom_20.500.14352_14col_20.500.14352_15

GRB 021004 modelled by multiple energy injections Ugarte Postigo, A. de Castro Tirado, A. J. Gorosabel, J. Jóhannesson, G. Björnsson, G. Gudmundsson, E. H. Bremer, M. Pak, S. Tanvir, N. Castro Cerón, J. M. Guzyi, S. Jelínek, M. Klose, S. Pérez Ramírez, D. Aceituno, J. Campo Bagatín, A. Covino, S. Cardiel López, Nicolás 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.degrees 8) of similar to 8 x 10(51) erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction (A(V) similar to 0.1) starburst galaxy with M-B similar or equal to -22.0. 2023-06-20T10:50:58Z 2023-06-20T10:50:58Z 2023-06-20T10:50:58Z 2005-12 journal article https://hdl.handle.net/20.500.14352/51333 0004-6361 10.1051/0004-6361;20052898 eng ESP2002-04124-C03-01 AYA2004-01515 01- 02-17106 open access EDP Sciencies