Issue |
A&A
Volume 443, Number 3, December I 2005
|
|
---|---|---|
Page(s) | 841 - 849 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20052898 | |
Published online | 15 November 2005 |
GRB 021004 modelled by multiple energy injections
1
Instituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, Spain e-mail: deugarte@iaa.es
2
Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland
3
IRAM - Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, 38406 Saint-Martin d'Hères, France
4
Dept. Physics, Astronomy & Maths, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK
5
Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
6
Nikolaev State University, Nikolska 24, 54030 Nikolaev, Ukraine
7
Thüringer Landessternwarte Tautenburg, 07778 Tautenburg, Germany
8
Dpto. de Física (EPS), Universidad de Jaén, 23071 Jaén, Spain
9
Calar Alto Observatory, Apartado de Correos 511, 04080 Almería, Spain
10
Departamento de Física, Universidad de Alicante, Apartado de Correos 99, 03080 Alicante, Spain
11
INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
12
Special Astrophysical Observatory of the Russian Academy of Sci. (SAO-RAS), Russia
13
US Naval Observatory, Flagstaff, AZ 86001, USA
14
Astrophysikalisches Institut, 14482 Potsdam, Germany
15
Solar Terrestrial Environment Laboratory, Nagoya University, Japan
16
INAF - IRA, Largo E. Fermi 5, 50125 Firenze, Italy
17
Departamento de Astronomía, Universidad de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
18
INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Italy
19
Dipartimento di Astronomia, Universitá di Bologna, via Ranzani 1, 40127 Bologna, Italy
20
INAF - IAS, via Fosso del Cavaliere 100, 00133 Roma, Italy
21
INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
22
INAF - Osservatorio Astronomico di Teramo, via M. Maggini 47, 64100 Teramo, Italy
23
Centro Galileo Galilei, Apartado 565, 38700 Santa Cruz de La Palma, Spain
24
Astronomical Institute of St. Petersburg University, Petrodvorets, Universitetsky pr. 28, 198504 St. Petersburg, Russia
25
INAF - Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
26
Department of Physics and Astronomy, University of Canterbury, Canterbury, New Zealand
Received:
17
February
2005
Accepted:
20
May
2005
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 18) of ~ erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction () starburst galaxy with .
Key words: gamma rays: bursts / galaxies: fundamental parameters / techniques: photometric
© ESO, 2005
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