EDP Sciences
Free access
Volume 433, Number 1, April I 2005
Page(s) 113 - 116
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20042030

A&A 433, 113-116 (2005)
DOI: 10.1051/0004-6361:20042030

GRB 040403: A faint X-ray rich gamma-ray burst discovered by INTEGRAL

S. Mereghetti1, D. Götz1, 2, M. I. Andersen3, A. Castro-Tirado4, F. Frontera5, 6, J. Gorosabel4, D. H. Hartmann7, J. Hjorth8, R. Hudec9, K. Hurley10, G. Pizzichini6, N. Produit11, A. Tarana12, M. Topinka9, P. Ubertini12 and A. de Ugarte4

1  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Milano "G.Occhialini", via Bassini 15, 20133 Milano, Italy
    e-mail: sandro@mi.iasf.cnr.it
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

(Received 20 September 2004 / 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

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