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The latest INTEGRAL/IBIS all-sky survey lists 219 hard X-ray sources whosenature is still unknown. We report on our ongoing campaign aimed at identifyingthese high-energy emitters by exploiting the focusing capabilities of the X-rayTelescope (XRT, 0.2-10 keV) on board Swift, which allow an enhancement of thesource localisation to arcsec level, thus facilitating the identification ofthe likely counterpart. By cross-correlating the list of the unidentified IBISsources included in the latest IBIS catalogue with Swift/XRT archival data, wefound a set of 14 objects, not yet reported in the literature, for which XRTdata were available. We found no detection in only one case, a single X-rayassociation in 9 sources, and 2/3 associations in the remaining objects. Wethen made use of multi-waveband archives to search for counterparts at otherwavelengths of these XRT detections and exploited X-ray spectral information inan attempt to determine their nature and association with the IBIS object. As aresult of our analysis, we identified a single counterpart for 13 sources,although in some cases its nature/class could not be assessed on the basis ofthe information collected. More specifically, we found that SWIFT J0924.2-3141and SWIFT J1839.1-5717 are absorbed AGN, while SWIFT J0800.7-4309 and 1SWXRTJ230642.8+550817 are Cataclysmic Variable binary systems. Finally, we foundthat IGR J14059-6116 is likely associated with the Fermi source 3FGLJ1405.4-6119. In the case of XMMSL1 J030715.5-545536 no XRT counterpart wasdetected. In all the other cases, optical/infrared spectroscopy is necessary toclassify properly each X-ray counterpart and confirm their association with theINTEGRAL/IBIS detection.

Investigating the X-ray counterparts to unidentified sources in the 1000-orbit INTEGRAL/IBIS catalogue