GRB 021219: The first Gamma-Ray Burst localized in real time with IBAS
Götz, D.; Mereghetti, S.; von Kienlin, A.; Foschini, L.; Malaguti, G.; Ubertini, P.; Bazzano, A.; Beckmann, V.
Italy, Switzerland, Germany
Abstract
On December 19, 2002, during the Performance and Verification Phase of INTEGRAL, a Gamma-Ray Burst (GRB) has been detected and localized in real time with the INTEGRAL Burst Alert System (IBAS). Here we present the results obtained with the IBIS and SPI instruments. The burst had a time profile with a single peak lasting about 6 s. The peak spectrum can be described by a single power law with photon index Gamma =1.6+/-0.1 and flux ~ 3.7 photons cm-2 s-1 (20-200 keV). The fluence in the same energy range is 9*E-7 erg cm-2. Time resolved spectroscopy performed with IBIS/ISGRI shows a clear hard to soft evolution of the spectrum.
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.