1020019

We propose in the present INTEGRAL AO-10 to monitor the Compton-thick AGN NGC 4945 for a total of 1 Msec. We will coordinate a snapshot of this monitoring with the incoming NuSTAR hard X-ray satellite for a simultaneous observation with INTEGRAL having the double goal of calibrating the two instruments while studying the spectral shape and variabity of NGC 4945. This campaign is unique in two respects: NGC 4945 is the only object suitable for an investigation of possible variations of a Compton-thick AGN which would confirm the first constraints on the structure and dimensions of the absorber/reflector in these objects and the proposed observations are a clear ideal case for combined NuSTAR/INTEGRAL obser- vations in order to cross-calibrate the two instruments and making full use of their unique high-energy spectral capabilities study the broad band spectrum of this archetypal Compton thick AGN. We propose to split this observational campaign in a sequence of 8 pointings of 100 ksec each before and after a 200 ksec measurement contemporaneous with NuSTAR. [truncated! Please see actual data for full text]