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The identification of low-energy counterparts for gamma-ray sources is one ofthe biggest challenge in modern gamma-ray astronomy. Recently, we developed andsuccessfully applied a new association method to recognize gamma-ray blazarcandidates that could be possible counterparts for the unidentified gamma-raysources above 100 MeV in the second Fermi Large Area Telescope (LAT) catalog(2FGL). This method is based on the Infrared (IR) colors of the recentWide-Field Infrared Survey Explorer (WISE) all-sky survey. In this letter weapplied our new association method to the case of unidentified INTEGRAL sources(UISs) listed in the fourth soft gamma-ray source catalog (4IC). Only 86 UISsout of the 113 can be analyzed, due to the sky coverage of the WISE Preliminarydata release. Among these 86 UISs, we found that 18 appear to have a gamma-rayblazar candidate within their positional error region. Finally, we analyzed theSWIFT archival data available for 10 out these 18 gamma-ray blazar candidates,and we found that 7 out of 10 are clearly detected in soft X-rays and/or in theoptical-ultraviolet band. We cannot confirm the associations between the UISsand the selected gamma-ray blazar candidates due to the discrepancies betweenthe INTEGRAL and the soft X-ray spectra. However, the discovery of the softX-ray counterparts for the selected gamma-ray blazar candidates adds animportant clue to help understand their origin and to confirm their blazarnature.

Searching for gamma-ray blazar candidates among the unidentified INTEGRAL sources