Abstract
The Gamma Ray Imaging Spectrometer (GRIS) was flown on balloons over Alice Springs, Australia on 26 April and 7 May 1992. A full Galactic Center transit (∼12 hours) was achieved on both flights with the instrument working nominally. The electron/positron annihilation line was detected on both flights at the 7–8 sigma level. A preliminary analysis of these results is presented and compared to earlier GRIS results and the results of GRO/OSSE observations of the Galactic Center. The GRIS 1992 results represent the first time that successive high resolution balloon measurements have been achieved on a time scale of days.
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