%0 Journal Article
%A Ugarte Postigo, A. de
%A Castro Tirado, A. J.
%A Gorosabel, J.
%A Jóhannesson, G.
%A Björnsson, G.
%A Gudmundsson, E. H.
%A Bremer, M.
%A Pak, S.
%A Tanvir, N.
%A Castro Cerón, J. M.
%A Guzyi, S.
%A Jelínek, M.
%A Klose, S.
%A Pérez Ramírez, D.
%A Aceituno, J.
%A Campo Bagatín, A.
%A Covino, S.
%A Cardiel López, Nicolás
%T GRB 021004 modelled by multiple energy injections
%D 2005
%@ 0004-6361
%U https://hdl.handle.net/20.500.14352/51333
%X 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.
%~