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The hard X-ray survey that Swift-BAT has been performing since late 2004 hasprovided a considerable database for a large number of sources whose hard X-rayemission was poorly known. We are exploiting the BAT survey archive to improvethe temporal and spectral characterization of the Galactic hard-X-ray sources.In this letter we focus on the study of the high mass X-ray binary AXJ1820.5-1434. All the data relevant to AX J1820.5-1434 have been extracted fromthe BAT survey archive and analyzed using a folding technique to search forperiodical modulations. A broad-band spectral analysis was also performedcomplementing the BAT spectrum with the available Swift-XRT and XMM-Newtonpointed observations. A timing analysis has revealed the detection of acoherent signal at P_0=54.0 +/- 0.4 days, that we interpret as the orbitalperiod of the binary system. When folded with a period of P_0, the light curveshows an asymmetric profile, with a minimum roughly consistent with zerointensity. The broad band spectral analysis performed coupling Swift-XRT,XMM-Newton and Swift-BAT spectra is well modeled with an absorbed power lawwith no evidence for an exponential cutoff.

The 54 days orbital period of AX J1820.5-1434 unveiled by Swift