0320043

We propose INTEGRAL ToO follow up observations of new Black Hole (BH) X-ray Novae (XN) detected in outburst in the direction of the Galactic Bulge (GB) and which are not subject to Core Program (CP) ToO observations. This proposal is the continuation of the one submitted in AO1 by Goldwurm et al. and in AO2 by Goldoni et al. which were awarded observing time. The first one has been triggered during 2003 and it has already produced valuable data and results on a new faint transient located in the GB (within 10 degrees from the Galactic Centre) region. In this sky region we expect during the third year of the INTEGRAL mission to observe 1 or 2 faint XN in outburst which will be too faint to fullfill the triggering criteria for CP ToO observations. INTEGRAL offers a unique possibility to study these far absorbed sources which lie in a very confused region of the sky. We propose 2 two day-long INTEGRAL ToO observations on one of these objects to be performed in the following way: the first one as soon as the trigger criteria are satisfied and therefore during the outburst peak the second when the spectral state of the source is changing. Both observations will provide a detailed spectrum from 3 to a few hundred keV which will determine the spectral parameters of the source. This will allow to study the relative contribution of ultra-soft reflection and hard components with their correlation to variability properties. In particular these observations will allow to search for the rare and variable high-energy emission lines of the type of those detected around 500 keV by SIGMA during the peak of Nova Muscae 1991 with a probable larger sample of XN than the one covered by the CP. We will also carry out correlated multi-wavelength observations with ground-based observatories. Radio/optical data are essential for astrophysical interpretation of high energy results and in specific we will search for correlation be [truncated! Please see actual data for full text]