EDP Sciences
Special letters issue on: first science with integral
Free Access
Issue
A&A
Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L311 - L314
Section Letters
DOI https://doi.org/10.1051/0004-6361:20031303
Published online 17 November 2003


A&A 411, L311-L314 (2003)
DOI: 10.1051/0004-6361:20031303

Letter

GRB 021219: The first Gamma-Ray Burst localized in real time with IBAS

S. Mereghetti1, D. Götz1, 2, V. Beckmann3, 4, A. von Kienlin5, P. Ubertini6, A. Bazzano6, L. Foschini7 and G. Malaguti7

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  Integral Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
4  Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
5  Max Planck Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany
6  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Roma, via Fosso del Cavaliere 100, 00133 Roma, Italy
7  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy

(Received 10 July 2003 / Accepted 26 August 2003)

Abstract
On December 19, 2002, during the Performance and Verification Phase of INTEGRAL, a Gamma-Ray Burst (GRB) has been detected and localized in real time with the INTEGRAL Burst Alert System (IBAS). Here we present the results obtained with the IBIS and SPI instruments. The burst had a time profile with a single peak lasting about 6 s. The peak spectrum can be described by a single power law with photon index $\Gamma=1.6\pm0.1$ and flux ~3.7 photons cm -2 s -1 (20-200 keV). The fluence in the same energy range is $9\times10^{-7}$ erg cm -2. Time resolved spectroscopy performed with IBIS/ISGRI shows a clear hard to soft evolution of the spectrum.


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

Offprint request: S. Mereghetti

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© ESO 2003

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