The Gamma-Ray Imaging Spectrometer (GRIS): Instrument Performance and Plans for Observing SN1987A

The Gamma-Ray Imaging Spectrometer (GRIS) is a powerful second- generation high-resolution gamma-ray spectrometer. It consists of an array of seven large (typically 200 cm sup 3) n-type germanium detectors surrounded by a thick (15 cm) Nal octive shield. Its energy range is 0.02 to 10 MeV. A new detector segmentation technique will be employed to reduce the detector background.