GRB 021004 modelled by multiple energy injections
A. de Ugarte PostigoInstituto de Astrofsica de Andaluca (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, SpainA. J. Castro-TiradoInstituto de Astrofsica de Andaluca (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, SpainJ. GorosabelInstituto de Astrofsica de Andaluca (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, SpainG. JóhannessonG. BjörnssonE. H. GudmundssonScience Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavk, IcelandM. BremerIRAM -Institut de Radio Astronomie Millimtrique, 300 rue de la Piscine, 38406 Saint-Martin d'Hres, FranceS. PakDept. Physics, Astronomy & Maths, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UKN. TanvirDept. Physics, Astronomy & Maths, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UKJ. M. Castro CerónS. GuzyiInstituto de Astrofsica de Andaluca (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, SpainM. JelínekS. KloseThringer Landessternwarte Tautenburg, 07778 Tautenburg, GermanyD. Pérez-RamírezJ. AceitunoCalar Alto Observatory, Apartado de Correos 511, 04080 Almera, SpainA. Campo BagatínS. CovinoINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyN. CardielCalar Alto Observatory, Apartado de Correos 511, 04080 Almera, SpainT. FathkullinSpecial Astrophysical Observatory of the Russian Academy of Sci. (SAO-RAS), RussiaA. A. HendenUS Naval Observatory, Flagstaff, AZ 86001, USAS. HuferathAstrophysikalisches Institut, 14482 Potsdam, GermanyY. KurataSolar Terrestrial Environment Laboratory, Nagoya University, JapanD. MalesaniINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyF. MannucciINAF -IRA, Largo E. Fermi 5, 50125 Firenze, ItalyP. Ruiz-LapuenteDepartamento de Astronoma, Universidad de Barcelona, Mart i Franqus 1, 08028 Barcelona, SpainV. SokolovSpecial Astrophysical Observatory of the Russian Academy of Sci. (SAO-RAS), RussiaU. ThieleCalar Alto Observatory, Apartado de Correos 511, 04080 Almera, SpainL. WisotzkiAstrophysikalisches Institut, 14482 Potsdam, GermanyL. A. AntonelliINAF -Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, ItalyC. BartoliniDipartimento di Astronomia, Universit di Bologna, via Ranzani 1, 40127 Bologna, ItalyA. BoattiniINAF -IAS, via Fosso del Cavaliere 100, 00133 Roma, ItalyA. GuarnieriDipartimento di Astronomia, Universit di Bologna, via Ranzani 1, 40127 Bologna, ItalyA. PiccioniDipartimento di Astronomia, Universit di Bologna, via Ranzani 1, 40127 Bologna, ItalyG. PizzichiniINAF -Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, via Gobetti 101, 40129 Bologna, ItalyM. del PrincipeINAF -Osservatorio Astronomico di Teramo, via M. Maggini 47, 64100 Teramo, ItalyA. di PaolaINAF -Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, ItalyD. FugazzaCentro Galileo Galilei, Apartado 565, 38700 Santa Cruz de La Palma, SpainG. GhiselliniINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyL. HuntINAF -IRA, Largo E. Fermi 5, 50125 Firenze, ItalyT. KonstantinovaAstronomical Institute of St. Petersburg University, Petrodvorets, Universitetsky pr. 28, 198504 St. Petersburg, RussiaN. MasettiINAF -Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, via Gobetti 101, 40129 Bologna, ItalyE. PalazziINAF -Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, via Gobetti 101, 40129 Bologna, ItalyE. PianINAF -Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, ItalyM. StefanonINAF -Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), ItalyV. TestaINAF -Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, ItalyP. J. TristramDepartment of Physics and Astronomy, University of Canterbury, Canterbury, New Zealand
2005en
ABI
Abstract
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. 8) of 8 10 51 erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction (A V 0.1) starburst galaxy with M B -22.0.
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Cited by 40 references