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For a significant number of the sources detected at high energies (>10 keV)by the INTEGRAL/IBIS and Swift/BAT instruments there is either a lackinformation about them in the 2-10 keV range or they are totally unidentified.Herein, we report on a sample of 34 IBIS AGN or AGN candidate objects for whichthere is X-ray data in the Swift/XRT archive. Thanks to these X-ray follow upobservations, the identification of the gamma ray emitters has been possibleand the spectral shape in terms of photon index and absorption has beenevaluated for the first time for the majority of our sample sources. Thesample, enlarged to include 4 more AGN already discussed in the literature, hasbeen used to provide photon index and column density distribution. We obtain amean value of 1.88 with a dispersion of 0.12, i.e. typical of an AGN sample.Sixteen objects (47%) have column densities in excess of 10^{22} cm^{-2} and,as expected, a large fraction of the absorbed sources are within the Sey 2sample. We have provided a new diagnostic tool (NH versusF(2-10)keV/F(20-100)keV softness ratio) to isolate peculiar objects; we find atleast one absorbed Sey 1 galaxy, 3 Compton thick AGN candidates; and one secureexample of a "true" type 2 AGN. Within the sample of 10 still unidentifiedobjects, 3 are almost certainly AGN of type 2; 3 to 4 have spectral slopestypical of AGN; and two are located high on the galactic plane and are strongenough radio emitters so that can be considered good AGN candidates.

Swift-XRT observation of 34 new INTEGRAL/IBIS AGNs: discovery of Compton thick and other peculiar sources