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09 February 2025

» arxiv » astro-ph/0412012

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GRB 040403: a faint X-ray rich Gamma-ray Burst discovered by INTEGRAL
S. Mereghetti ; D. Gotz ; M.I. Andersen ; A. Castro-Tirado ; F. Frontera ; J. Gorosabel ; D. H. Hartmann ; J. Hjorth ; R. Hudec ; K. Hurley ; G. Pizzichini ; N. Produit ; A. Tarana ; M. Topinka ; P. Ubertini ; A. de Ugarte ;
Date:	1 Dec 2004
Journal:	Astron.Astrophys. 433 (2005) 113-116 DOI: 10.1051/0004-6361:20042030
Subject:	astro-ph
Abstract:	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 hours after the burst, indicates a rather faint afterglow, similar to those seen in other relatively soft and faint bursts.
Source:	arXiv, astro-ph/0412012
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