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The most recent all-sky surveys performed with the INTEGRAL and SWIFTsatellites allowed the detection of more than 1500 sources in hard X-rays above20 keV. About one quarter of them has no obvious counterpart at otherwavelengths and therefore could not be associated with any known class ofhigh-energy emitting objects. Although cross-correlation with catalogues orsurveys at other wavelengths (especially soft X-rays) is of invaluable supportin pinpointing the putative optical candidates, only accurate opticalspectroscopy can reveal the true nature of these sources. With the aim ofidentifying them, we started in 2004 an optical spectroscopy program which usesdata from several telescopes worldwide and which proved extremely successful,leading to the identification of about 200 INTEGRAL objects and nearly 130Swift sources. Here we want to present a summary of this identification workand an outlook of our preliminary results on identification of newly-discoveredsources belonging to the 4th IBIS catalog and to the 54 months PalermoSwift/BAT catalog.

Identification of newly-discovered sources belonging to the 4th IBIS catalog and to the 54 months Palermo Swift/BAT catalog