GRIS Observations of Gamm-Ray Line Profiles from SN1987A

We report observations of fully resolved gamma-ray lines from the decay of Co in Supernova 1987A. Gamma-ray line profiles provide a direct probe of the distribution of freshly synthesized radioactive material in the supernova, which is free from the effects of ionization states and resonant scattering that complicate the interpretation of optical and infrared lines. Data are from the first two balloon flights of the Gamma-Ray Imaging Spectrometer (GRIS), the first of a new generation of high resolution gamma- ray spectrometers for astrophysics.