1520038

As a follow-up of our earlier observations (2 Ms in AO-1 2.5 Ms in AO-2 2 Ms in AO-3 and 1.6 Ms in AO-14) we propose a new deep 1.6 Msec exposure of the Galactic Center field which corresponds to 15% share time in the total available for this target in AO-15. Observations of the GC region make the best use of the unique INTEGRAL capabilities and undoubtedly are the most efficient investment of its precious observing time. It is important for the study of Galactic diffuse nuclear and positron annihilation lines however the main objectives of the proposed observations are the monitoring of Sgr A* and two dozens of black-hole and many other peculiar X-ray binaries and search for the new transient sources and phenomena. [truncated! Please see actual data for full text]