  The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources,
which are still unclassified. To identify these sources, we need to find their
counterparts at other wavelengths and then study their nature. The capability
of XRT on board Swift to localize the sources with a positional accuracy of few
arcseconds allows the search for optical/UV, infrared and radio counterparts to
be more efficient and reliable. We analysed all XRT observations available for
three unidentified INTEGRAL sources, IGR J18249-3243, IGR J19443+2117 and IGR
J22292+6647, localized their soft X-ray counterparts and searched for
associations with objects in the radio band. We also combined X-/gamma-ray
data, as well as all the available radio, infrared and optical/UV information,
in order to provide a broad-band spectral characterization of each source and
investigate its nature. All three sources are found to be bright and repeatedly
observed radio objects, although poorly studied. The X-/gamma-ray spectrum of
each source is well described by power laws with photon indices typical of AGN;
only IGR J19443+2117 may have absorption in excess of the Galactic value, while
IGR J22292+6647 is certainly variable at X-ray energies. IGR J18249-3243 has a
complex radio morphology and a steep radio spectrum; the other two sources show
flatter radio spectra and a more compact morphology. Overall, their radio,
optical/UV and infrared characteristics, as well as their X-/gamma-ray
properties, point to an AGN classification for all three objects.
