0320092

As a follow-up of the 2 Msec observation in AO-1 and 2.5 Msecobservation in AO-2 we propose a new deep 3.4 Msec exposure of thefield of the Galactic Center which corresponds to 27% share time inthe total available for this target in AO3. Observations of the GCregion make the best use of the unique INTEGRAL capabilities andundoubtedly are the most efficient investment of its preciousobserving time. It is especially important in the study of Galacticdiffuse nuclear and positron annihilation lines. With the proposedobservation the total INTEGRAL exposure of the GC field will exceed 15Msec by the end of AO-3 which will increase the sensitivity ofINTEGRAL instruments in this very interesting region. As confirmed bythe analysis of available first ~4 Msec of the AO-1 and AO-2observations the guaranteed science includes detailed study of thediffuse gamma-ray line and continuum emission monitoring of Sgr A*and of dozens of X-ray binaries study of transient phenomena. Shouldthis proposal be accepted the data will be made available during theproprietary period to scientists of major astrophysical institutionsof Russia. [truncated! Please see actual data for full text]