Overview of the first results from EGRET

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Ray Astronomy, Gamma Ray Telescopes, Sky Surveys (Astronomy), Spaceborne Astronomy, Active Galactic Nuclei, Energy Spectra, Galactic Radiation, Pulsars, Quasars, Solar Flares, Stellar Radiation

Scientific paper

An overview of the early results of EGRET, one of four instruments carried on the Compton Gamma Ray Observatory, is presented with regard to observations of pulsars, bursts, galactic diffuse radiation, and active galaxies. The June 11, 1992 solar flare was observed in gamma rays with energies from the threshold of detection to energies over 1 GeV. Detailed time histories and energy spectra were obtained for the Crab and Vela pulsars, with one of the Vela pulses being quite sharp, approximately 2 percent of the total period. Several gamma-ray bursts were recorded. The one on May 3, 1991 was seen in EGRET's spark chamber system, which made it possible to determine a position. The quasars 3C 279, which has a redshift of 0.538, was seen in high energy gamma rays in both June and October 1992.

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