Observation of GRB 030131 with the INTEGRAL satellite
Pian, E.; Frontera, F.; Hurley, K.; Götz, D.; Mereghetti, S.; Hartmann, D. H.; Ubertini, P.; Mirabel, I. F.; Gorosabel, J.; Feroci, M.; Hjorth, J.; Hudec, R.; Winkler, C.; Fruchter, A.; Deluit, S.; Pizzichini, G.
Italy, United States, Switzerland, Spain, Denmark, Czech Republic, France, Argentina, Netherlands
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 ~ 150 s, 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 Gamma =~ 1.7 and has a flux of ~ 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*E-6 erg cm-2 (20-200 keV).
Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA, and on observations collected by the Gamma-Ray Burst Collaboration at ESO (GRACE) at the European Sourthern Observatory, Paranal, Chile (Programme 70.D-0523).