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We report results from an investigation at hard X-rays (above 18 keV) andsoft X-rays (below 10 keV) of a sample of X-ray transients located on theGalactic plane and detected with the bursticity method, as reported in thelatest 1,000 orbits INTEGRAL/IBIS catalog. Our main aim has been to individuatethose with X-rays characteristics strongly resembling Supergiant Fast X-rayTransients (SFXTs). As a result, we found four unidentified fast X-raytransients which now can be considered good SFXT candidates. In particular,three transients (IGR J16374-5043, IGR J17375-3022 and IGR J12341-6143) werevery poorly studied in the literature before the current work, and our findingslargely improved the knowledge of their X-ray characteristics. The othertransient (XTE J1829-098) was previously studied in detail only below 10 keV,conversely the current work provides the first detailed study in outburst above18 keV. In addition we used archival infrared observations of the transients topinpoint, among the field objects, their best candidate counterpart. We foundthat their photometric properties are compatible with an early type spectralclassification, further supporting our proposed nature of SFXTs. Infraredspectroscopy is advised to confirm or disprove our interpretation. The reportedfindings allowed a significant increase of the sample of candidate SFXTs knownto date, effectively doubling their number.

Chasing candidate Supergiant Fast X-ray Transients in the 1,000 orbits INTEGRAL/IBIS catalog