GRB 021125: The first GRB imaged by INTEGRAL
Götz, D.; Goldoni, P.; Mereghetti, S.; von Kienlin, A.; Foschini, L.; Di Cocco, G.; Malaguti, G.; Bird, A. J.; Ubertini, P.; Segreto, A.; Bazzano, A.; Del Santo, M.; Paizis, A.; Beckmann, V.; Skinner, G.
Italy, Switzerland, Germany, United Kingdom, France
Abstract
In the late afternoon of November 25th, 2002 a gamma-ray burst (GRB) was detected in the partially coded field of view (about 7.3deg from the centre) of the imager IBIS on board the INTEGRAL satellite. The instruments on-board INTEGRAL allowed, for the first time, the observation of the prompt gamma-ray emission over a broad energy band from 15 to 500 keV. GRB 021125 lasted ~ 24 s with a mean flux of ~ 5.0 photons cm-2 s-1 in the 20-500 keV energy band, and a fluence of ~ 4.8x 10-5 erg cm-2 in the same energy band. Here we report the analysis of the data from the imager IBIS and the spectrometer SPI.
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, Spain, Switzerland), Czech Republic and Poland, and with the participation of Russia and the USA.