  The limited angular resolution of gamma-ray telescopes prevents the straight
identification of the majority of the sources detected so far. This is
particularly true for the low latitude, probably galactic ones, only 10 % of
which has been identified. Most of the counterparts are Isolated Neutron Stars,
both radio-loud and radio-quiet, characterised by an extremely high value of
X-ray-to-optical flux ratio. The best way to search for INSs in the error boxes
of unidentified EGRET sources is to perform the X-ray coverage of the gamma-ray
field, followed by the optical characterization of each X-ray source. We
applied this procedure to two EGRET sources, which could belong to a local
galactic population: 3EG J0616-3310 and 3EG J1249-8330. Here we report on the
analysis of about 300 X-ray objects, as well as on their optical study.
