We briefly review the fundamentals of nuclear gamma-ray line astronomy (radioactive astronomy), focusing on its role to decipher the intimate physics of supernovae, either immediatly (via 56 Co) or after a time delay (via 44 T i). All kinds of super-novae can be in principle tested through their radioactivities and their associated gamma-ray lines. Dedicated to the spectroscopy and imaging of c...

Gamma ray bursts (GRBs) are astronomical phenomena detected at highest energies. The gamma photons carry energies on the order of mega-electronovolts and arrive to us from point-like sources that uniformly distributed sky. A typical burst has a form pulse lasts for about minute. As Earth atmosphere is not transparent very high energy radiation, by means telescopes onboard satellites placed orbi...