0520018

GRS 1915 is a key target for the understanding of microquasars and accreting black holes in general. It can undergo on short timescales (sec-min) transitions that occur on longer timescales (~days to weeks) in other sources. We hence can catch them very easily while pointing INTEGRAL and thus have an unique chance to understand their physical origin through a broad band (spectral and temporal) study of the source. We then propose to continue the monitoring of GRS 1915+105 and its surroundings during AO5. The simultaneous use of JEM-X in the soft X-rays IBIS and SPI in the soft Gamma-rays will enable us to study the origin of the spectral transitions giving birth to a particular class of variability. We aim at studying the interplay between the soft and hard X-ray components the different time scales of their variations in relation with different physical models and the tight connection between the accretion and ejection processes. For this purpose we will provide simultaneous radio (Ryle VLA Nancay) and infrared (ESO) observations. IBIS JEM-X are the prime instruments for this study together with SPI in cases of steady states. Although GRS 1915+105 is the main target of our study we outline here that amongst the ~10 sources usuallyobserved in this field our team aims at studying a handful of them with particular attention to IGR J19140+0951 (which is always in the totally coded field of view of IBIS and detectable with JEM-X) with the view to study its spectral behaviour/evolution (along its known orbit) and survey Ser X-1 Aql X-1 XTE J1908+094 (in the TCFOV) the latter 2 are transient and monitor their X-ray evolution along a possible outburst. For these particular sources multi-wavelength observations will also be conducted. We request that our observations be undertaken in segments of 20 ks exposures during the entire visibility period of 6 months once every second revolution hence 30 p [truncated! Please see actual data for full text]