0220028

Encouraged by the success of the AO1 INTEGRAL monitoring campaign on GRS 1915+105 we propose to continue the monitoring of the most enigmatic microquasar of our Galaxy during AO2. Two of our three AO1 observation q`and the 2 ToO observations were primilary done during the plateau state of the source. Our main goal is to obtain time-resolved hard X-ray spectra of all the fundamental states of GRS 1915+105 in order to fix the origin of the hard tail - as seen by IBIS and SPI - and thus enable us to test different models: Comptonization by thermal nonthermal or free-fall electrons and/or synchrotron emission from the compact jet. In addition we are in position to provide simultaneous radio and infrared observations which will allow us to further study the accretion-ejection links. JEM-X will allow us to discriminate between spectral states in the course of each observation and study with the long exposure time the very low frequency QPOs (<10 mHz). As for the past campaign the INTEGRAL observations will be conducted simultaneously with RXTE in order to explore the rapid variability (0.1-100 Hz) at both low and high energies. The complementarity of the INTEGRAL instruments will also enable us to study any possible annihilation line features. To achieve our goals and especially obtain spectra up to very high energy we need long exposure times. We request that our observations be undertaken in segments of 100 ksec exposures. To meet our scientific goals we require ten such segments each separated by approximately one month compatible with scheduling constraints. [truncated! Please see actual data for full text]