Two black hole X-ray novae observed with BeppoSAX WFC in the Galactic Bulge

The two transient sources GRS 1739-278 ( Vargas et al., 1997) and GRS 1737- 31 (Sunyaev et al., 1997) discovered by Granat/SIGMA in the period 1996-199 7 have been classified as BHCs on the basis of their variability and spectr al behaviour. GRS1739-278 has been detected by the BeppoSAX Wide Field Came ras (WFC) in the 2-10 keV range at a Aux level of similar to 150 mCrab, i.e . a factor similar to 5 below the outburst maximum. The observations show t hat the source is still in high/soft state. GRS 1737-31 has also been detec ted in March 1997, its emission standing up clearly only at energies above similar to 3.5 keV, suggesting a quite hard spectrum as also confirmed by o bservations of the PCA and HEXTE instruments on board RXTE (Cui ct al., 199 7). We report here on a preliminary analysis of these observations and disc uss the spectral parameters in some detail.