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Issue A&A
Volume 409, Number 3, October III 2003
Page(s) 831 - 834
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20031128



A&A 409, 831-834 (2003)
DOI: 10.1051/0004-6361:20031128

Observation of GRB 030131 with the INTEGRAL satellite

D. Götz1, 2, S. Mereghetti1, K. Hurley3, S. Deluit4, M. Feroci5, F. Frontera6, 7, A. Fruchter8, J. Gorosabel8, 9, D. H. Hartmann10, J. Hjorth11, R. Hudec12, I. F. Mirabel13, 14, E. Pian15, G. Pizzichini7, P. Ubertini5 and C. Winkler16

1  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Milano "G. Occhialini", Via Bassini 15, 20133 Milano, Italy
2  Dipartimento di Fisica, Università degli Studi di Milano Bicocca, P.zza della Scienza 3, 20126 Milano, Italy
3  UC Berkeley Space Sciences Laboratory, Berkeley CA 94720-7450, USA
4  Integral Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
5  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, via Fosso del Cavaliere 100, 00133 Roma, Italy
6  Dipartimento di Fisica, Università di Ferrara, Via Paradiso 12, 44100 Ferrara, Italy
7  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Bologna, via Piero Gobetti 101, 40129 Bologna, Italy
8  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
9  Instituto de Astrofísica de Andalucía (IAA-CSIC), PO Box 03004, 18080 Granada, Spain
10  Department of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978, USA
11  Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
12  Astronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ondrejov, Czech Republic
13  Service d'Astrophysique, CEA/Saclay, Orme des Merisiers, Bât. 709, 91191 Gif-sur-Yvette, France
14  Instituto de Astronomia y Fisica del Espacio / CONICET, cc67, suc 28. 1428 Buenos Aires, Argentina
15  Osservatorio Astronomico di Trieste, Via GB Tiepolo 11, 34131 Trieste, Italy
16  ESA-ESTEC, RSSD, Keplerlaan 1, 2201 AZ Nordwijk, The Netherlands

(Received 3 June 2003 / Accepted 23 July 2003 )

Abstract
A long Gamma-Ray Burst (GRB) was detected with the instruments on board the INTEGRAL satellite on January 31 2003. Although most of the GRB, which lasted ~150 s, occurred during a satellite slew, the automatic software of the INTEGRAL Burst Alert System was able to detect it in near-real time. Here we report the results obtained with the IBIS instrument, which detected GRB 030131 in the 15 keV-200 keV energy range, and ESO/VLT observations of its optical transient. The burst displays a complex time profile with numerous peaks. The peak spectrum can be described by a single power law with photon index $\Gamma\simeq1.7$ and has a flux of ~2 photons cm -2 s -1 in the 20-200 keV energy band. The high sensitivity of IBIS has made it possible for the first time to perform detailed time-resolved spectroscopy of a GRB with a fluence of $7\times10^{-6}$ erg cm -2 (20-200 keV).


Key words: gamma rays: bursts -- gamma rays: observations

Offprint request: D. Götz, diego@mi.iasf.cnr.it

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© ESO 2003


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