Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, we obtained optical spectroscopy for 75 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/Burst Alert Telescope (BAT) and listed in the 54 month Palermo catalogue. All these objects also have observations taken with Swift/X-ray Telescope (XRT) or Chandra satellites, which allowed us to reduce the high-energy error box and pinpoint the most likely optical counterparts.

Cone search capability for table J/A+A/561/A67/table23 (Main results obtained from the analysis of the optical spectra of the 35 type 1 AGNs and 33 type 2 AGNs (with remaining sources with spectra added))