Observation of GRB 030131 with the INTEGRAL satellite

Abstract

A long Gamma-Ray Burst (GRB) was detected with the instruments on board the INTEGRAL satellite on January 31 2003. Although most of the GRB, which lasted $\sim$150 seconds, occurred during a satellite slew, the automatic software of the INTEGRAL Burst Alert System was able to detect it in near-real time. Here we report the results obtained with the IBIS instrument, which detected GRB 030131 in the 15 keV - 200 keV energy range, and ESO/VLT observations of its optical transient. The burst displays a complex time profile with numerous peaks. The peak spectrum can be described by a single power law with photon index $\hat{I}“\simeq$1.7 and has a flux of $\sim$2 photons cm${}^{-2}$ s${}^{-1}$ in the 20-200 keV energy band. The high sensitivity of IBIS has made it possible for the first time to perform detailed time-resolved spectroscopy of a GRB with a fluence of 7$\times 10^{-6}$ erg cm${}^{-2}$ (20-200 keV).

Accepted for publication in A&A, 5 pages, 4 figures, latex