GRB 040403: a faint X-ray rich Gamma-ray Burst discovered by INTEGRAL
arXiv:astro-ph/0412012 · doi:10.1051/0004-6361:20042030
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.
arXiv comment5 pages, 3 figures, accepted for publication in Astronomy and Astrophysics Letters
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