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The Burst Alert Telescope (BAT: 14-150 keV) on board of Swift is mainly devoted to the monitoring of a large fraction of the sky (50%-80% per day) for the occurrence of Gamma Ray Bursts. This provides the opportunity for a substantial gain of our k nowledge of the Galactic and extragalactic sky in the hard X-ray domain. Here we present the third PalermoSwift-BAT hard X-ray catalogue obtained from the analysis of the data relat iv to the first 66 months of the Swift mission and including 1500 high-energy sources. With a prog ram of soft X-ray follow-up observations and by using archival data we were able to associate a counterpart to most of these high energy emitters: 59% are extragalactic objects, 20% are Gal actic objects and 9% are known soft X-ray emitters whose nature has not been determined yet. We c ompare our catalogue with those obtained from the INTEGRAL-ISGRI data and with the gamma-ra y sky as seen by Fermi.

Swift-BAT: the hard-X-ray sky after 64 months of survey