Multi-wavelength observations of gamma-ray pulsars detected by Fermi

In this talk, we present the outcome of X-ray and optical/IR observations of gamma-ray pulsars detected by Fermi, as a part of a program aimed at completing the multi-wavelength coverage of these sources. We found X-ray/optical counterparts for a few Fermi pulsars, and we observed in X-ray some unidentified Fermi sources believed to be isolated neutron stars.