VLA observations of SIGMA hard X-ray sources in the galactic bulge

Multi-epoch VLA radio observations of the error boxes of different hard X-ray sources in the galactic bulge have been carried out. Our main goal here is to search for radio counterparts of new microquasar sources and related X-ray binary systems. The identifications should be possible, in principle, on the basis of significant radio variability usually shown by this kind of objects. We report here the results obtained in the cases of Terzan 2 and GX 1+4.