Comparing the observed properties of the GRBs detected by the Fermi and Swift satellites

Authors: Istvan Horvath; Balazs, L.G.; Bagoly, Z. and Kobori, J.

Abstract: We studied the distribution of the GRBs, observed by the Fermi satellite, in the multidimensional parameter space consiting of the duration, fluence, peak flux and peak energy (if it was available). About 10% of the Fermi bursts was observed also by the Swift satellite. We did not find significant differences between the peak flux and peak energy of GRBs observed and not obseved also by the Swift satellite. In contrast, those GRBs detected also by the Swift satellite had significanly greater fluence. We did a similar study for the GRBs detected by the Swift satellite. About 30% percent of these burst was also measured by the Fermi satellite. We found a significant difference in the fluence and peak flux but none in the other gamma (duration, photon index) and X-ray (early flux, decay and spectral index). Those Swift bursts which were detected also by the Fermi sastellite had significantly higher peak flux and fluence. These differences may be accounted for the differnt construction and observing strategy of the Fermi and Swift satellites.