Simulation study of COSMIC - A Compton telescope all-sky monitor concept for low-energy gamma-ray astronomy

The highly transient nature of cosmic low-energy gamma-ray sources offers u nique insight into the astrophysics of extreme processes. Sensitive, long-t erm, all-sky monitoring is required to make sense of the variable emission. Instrumentation for such observations must have the combination of Large e ffective collection area, wide field-of-view and good angular resolution. R ecent advances in position-sensitive detectors and associated electronics m ake it possible to consider a multi-scatter Compton telescope, combined wit h a coded mask, as an all-sky monitor in the energy range similar to 10 keV to a few MeV. We present simulations of various configurations of such an instrument and show that it can provide a substantial improvement over othe r sky monitor strategies in this energy regime.