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
DOIAbstract
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
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