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Highlights of the Energetic Gamma Ray Experiment Telescope

The significant potential contribution of high energy gamma ray astronomy to astrophysics had been recognized for a long time due to its direct connection to the dynamic high energy processes in the universe, but building a successful high energy gamma ray telescope qualified for space flight is difficult. The results of early small telescopes, especially those of SAS-2 and COS-B, gave support to the hopes for a rich return when a more sensitive instrument was flown. The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (GRO) has over ten times the sensitivity of these two earlier satellite telescopes just mentioned. It covers the energy range from about 2x107 eV to ap roximately 3x1010 eV. A description of the instrument is given by Kanbach et