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Issue A&A
Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L327 - L330
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031075



A&A 411, L327-L330 (2003)
DOI: 10.1051/0004-6361:20031075

Letter

Time resolved spectroscopy of GRB 030501 using INTEGRAL

V. Beckmann1, 2, J. Borkowski2, T. J.-L. Courvoisier2, 3, D. Götz4, R. Hudec5, F. Hroch2, 5, N. Lund6, S. Mereghetti4, S. E. Shaw2, 7, A. von Kienlin8 and C. Wigger9

1  Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
2  INTEGRAL Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
3  Geneva Observatory, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
4  Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR v. Bassini 15, 20133 Milano, Italy
5  Astronomical Institute, Academy of Sciences of the Czech Republic, 25165 Ondrejov, Czech Republic
6  Danish Space Research Institute, Juliane Maries Vej 30, 2100, Copenhagen, Denmark
7  School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
8  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
9  Paul Scherrer Institut, 5232 Villingen, Switzerland

(Received 28 May 2003 / Accepted 26 June 2003)

Abstract
The gamma-ray instruments on-board INTEGRAL offer an unique opportunity to perform time resolved analysis on GRBs. The imager IBIS allows accurate positioning of GRBs and broad band spectral analysis, while SPI provides high resolution spectroscopy. GRB 030501 was discovered by the INTEGRAL Burst Alert System in the ISGRI field of view. Although the burst was fairly weak (fluence $F_{20-200 \,{\rm keV} } \simeq 3.5 \times 10^{-6}\,\rm {erg\,cm}^{-2})$ it was possible to perform time resolved spectroscopy with a resolution of a few seconds. The GRB shows a spectrum in the 20-400 keV range which is consistent with a spectral index $\Gamma = -1.8$. No emission line or spectral break was detectable in the spectrum. Although the flux seems to be correlated with the hardness of the GRB spectrum, there is no clear soft to hard evolution seen over the duration of the burst. The INTEGRAL data have been compared with results from the Ulysses and RHESSI experiments.


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

Offprint request: V. Beckmann, Volker.Beckmann@obs.unige.ch

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