Cusumano, GiancarloGiancarloCusumanoLa Parola, V.V.La ParolaSegreto, A.A.SegretoGiommi, PaoloPaoloGiommi2020-09-172020-09-172010-02-01https://hdl.handle.net/20.500.13025/1959American Astronomical Society, HEAD meeting #11, #35.08; <ALTJOURNAL>Bulletin of the American Astronomical Society, Vol. 41, p.715</ALTJOURNAL>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 knowledge of the Galactic and extragalactic sky in the hard X-ray domain. Here we present the Second Palermo Swift-BAT hard X-ray catalogue (http //bat.ifc.inaf.it), obtained from the analysis of the data relative to the first 54 months of the Swift mission and including about 1300 BAT sources, 1100 of them associated to a softer counterpart using a large follow-up campain with Swift/XRT. The BAT catalogue includes 62.5% of extragalactic objects, 22.5% of Galactic objects and 15% of known Xray emitters whose nature has not been determined yet. We cross-correlated this sample with Rosat all-sky survey and the Fermi catalogue. Broad band spectral analysis is presented for the different classes of extragalactic sources.http://adsabs.harvard.edu/abs/2010HEAD...11.3508C2010HEAD...11.3508C