GRB 021004 modelled by multiple energy injections
A. de Ugarte PostigoInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, E-18080 Granada, SpainCastro Tirado, A. J.Instituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, E-18080 Granada, SpainJ. GorosabelInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, E-18080 Granada, SpainG. JóhannessonScience Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, IcelandG. BjörnssonScience Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, IcelandE. H. GudmundssonScience Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, IcelandMichael BremerIRAM -Institute de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint-Martin d'Hères, FranceS. PakDept. Physics, Astronomy & Maths, University of Hertfordshire, College Lane, Hatfield, Herts, AL10 9AB, United KingdomN. R. TanvirDept. Physics, Astronomy & Maths, University of Hertfordshire, College Lane, Hatfield, Herts, AL10 9AB, United KingdomJ. M. Castro CerónNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, DenmarkS. GuzyiNikolaev State University, Nikolska 24, 54030, Nikolaev, UkraineM. JelínekInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, E-18080 Granada, SpainS. KloseThüringer Landessternwarte Tautenburg, D-07778 Tautenburg, GermanyPérez Ramírez, D.Dpto. de Física (EPS), Universidad de Jaén, E-23071, Jaén, SpainJ. AceitunoCalar Alto Observatory, Apartado de Correos 511, E-04080, Almería, SpainAdriano Campo BagatínDepartamento de Física, Universidad de Alicante, Apartado de Correos 99, E-03080 Alicante, SpainS. CovinoINAF -Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), ItalyN. CardielCalar Alto Observatory, Apartado de Correos 511, E-04080, Almería, Spain
2005en
ABI
Annotatsiya
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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