  Following a series of deep observations of the Galactic Bulge region
performed with the Wide Field Cameras on board BeppoSAX, it has been possible
to study throughout a long time period a number of persistent X-ray sources. We
report on the behaviour of GRS 1758-258, an X-ray binary suggested as a black
hole candidate on the basis of its timing and spectral characteristics. The
source has been monitored for almost 2 years since August 1996; preliminary
results of the data analysis are shown hereafter.
