Volume 433, Number 1, April I 2005
|Page(s)||113 - 116|
|Published online||14 March 2005|
GRB 040403: A faint X-ray rich gamma-ray burst discovered by INTEGRAL*
Istituto di Astrofisica Spaziale e Fisica Cosmica – CNR, Sezione di Milano “G.Occhialini”, via Bassini 15, 20133 Milano, Italy e-mail: email@example.com
2 Dipartimento di Fisica, Università degli Studi di Milano Bicocca, P.zza della Scienza 3, 20126 Milano, Italy
3 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
4 Instituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos 3004, 18080 Granada, Spain
5 Physics Department, University of Ferrara, via Paradiso 12, 44100 Ferrara, Italy
6 Istituto di Astrofisica Spaziale e Fisica Cosmica – CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
7 Clemson University, Department of Physics & Astronomy, Clemson, SC 29634-0978, USA
8 Niels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
9 Astronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ondrejov, Czech Republic
10 University of California at Berkeley, Space Sciences Laboratories, Berkeley, CA 94720-7450, USA
11 Integral Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
12 Istituto di Astrofisica Spaziale e Fisica Cosmica – CNR, Sezione di Roma, via Fosso del Cavaliere 100, 00133 Roma, Italy
Accepted: 1 December 2004
GRB 040403 is one of the faintest gamma-ray bursts for which a rapid and accurate localization has been obtained. Here we report on the gamma-ray properties of this burst, based on observations with the IBIS instrument aboard INTEGRAL, and the results of searches for its optical afterglow. The steep spectrum (power law photon index = 1.9 in the 20–200 keV range) implies that GRB 040403 is most likely an X-ray rich burst. Our optical limit of R > 24.2 at 16.5 h after the burst, indicates a rather faint afterglow, similar to those seen in other relatively soft and faint bursts.
Key words: gamma rays: bursts / gamma rays: observations
© ESO, 2005
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