0320014

We propose target of opportunity observations (TOO) of a major radio/hard X-ray flare of the relativistic jet source Cyg X-3. These observations will provide an opportunity to use INTEGRALs unique capabilities to explore the hard X-ray/Gamma-ray emission. which occurs during jet production in this system. We present evidence for the production of highly relativitic jets that have a corresponding hard X-ray/Gamma-ray emission. The proposed observations will allow us to examine the nature of this emission and possibly detect the presence of annihilation lines. Additional if lines are detected and have Doppler shifts we can directly measure the speed of the important step towards solving the problem of what jets are made of. [truncated! Please see actual data for full text]