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arxiv: astro-ph/0412012 · v1 · submitted 2004-12-01 · 🌌 astro-ph

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
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R. Hudec K. Hurley G. Pizzichini N. Produit A. Tarana M. Topinka P. Ubertini A. de Ugarte
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keywords burstfaintgamma-rayafterglowburstsintegralopticalrich
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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.

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