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Issue A&A
Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L307 - L310
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031155



A&A 411, L307-L310 (2003)
DOI: 10.1051/0004-6361:20031155

Letter

GRB 021125: The first GRB imaged by INTEGRAL

G. Malaguti1, A. Bazzano2, V. Beckmann3, 4, A. J. Bird5, M. Del Santo2, G. Di Cocco1, L. Foschini1, P. Goldoni6, D. Götz7, S. Mereghetti7, A. Paizis3, A. Segreto8, G. Skinner9, P. Ubertini2 and A. von Kienlin10

1  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
2  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR, Sezione di Roma, via Fosso del Cavaliere 100, 00133 Roma, Italy
3  INTEGRAL Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
4  Institut für Astronomie and Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
5  School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
6  CEA Saclay, DSM/DAPNIA/SAp, 91191 Gif-sur-Yvette Cedex, France
7  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR, Sezione di Milano, via Bassini 15, 20133 Milano, Italy
8  Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR, Sezione di Palermo, via U. La Malfa 153, 90146 Palermo, Italy
9  Centre d'Étude Spatiale des Rayonnements, 9 avenue du Colonel Roche, 31028 Toulouse Cedex 4, France
10  Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany

(Received 14 July 2003 / Accepted 30 July 2003 )

Abstract
In the late afternoon of November 25th, 2002 a gamma-ray burst (GRB) was detected in the partially coded field of view (about $7.3^{\circ}$ from the centre) of the imager IBIS on board the INTEGRAL satellite. The instruments on-board INTEGRAL allowed, for the first time, the observation of the prompt gamma-ray emission over a broad energy band from 15 to 500 keV. GRB 021125 lasted ~24 s with a mean flux of ~5.0 photons cm -2 s -1 in the 20-500 keV energy band, and a fluence of ~ $4.8\times 10^{-5}$ erg cm -2 in the same energy band. Here we report the analysis of the data from the imager IBIS and the spectrometer SPI.


Key words: gamma rays: burst -- gamma rays: observations

Offprint request: G. Malaguti, malaguti@bo.iasf.cnr.it

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© ESO 2003


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