Comparing the observed properties of the GRBs detected by the Fermi and
  Swift satellites
  We studied the distribution of the GRBs, observed by the Fermi satellite, in
the multidimensional parameter space consisting 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 observed also by
the Swift satellite. In contrast, those GRBs detected also by the Swift
satellite had significantly greater Fluence and duration. We did a similar
study for the GRBs detected by the Swift satellite. About 30% percent of these
bursts was also measured by the Fermi satellite. We found a significant
difference in the Fluence, Peak flux and Photon index but none in duration.
These differences may be accounted for the different construction and observing
strategy of the Fermi and Swift satellites.
