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Published online by Cambridge University Press: 30 March 2016
The Gamma Ray Observatory was launched on April 7, 1991 for a mission expected to last several years. Its four instruments are designed to study gamma ray emission over a wide energy regime from 0.02 to over 30,000 MeV. Following a brief description of the capabilities of each instrument and their status, the viewing program and is discussed, and some very early results are presented.