THE 2ND EGRET CATALOG OF HIGH-ENERGY GAMMA-RAY SOURCES

The second catalog of high-energy gamma-ray observations from the Ener getic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory, includes data from phase 1 (1991 April-1992 November) and phase 2 (1992 November-1993 September) of the mission. In addition to including more data than the first EGRET catalog, this catalog uses a n improved model of the diffuse Galactic gamma radiation. The 129 sour ces in the catalog include one solar flare bright enough to be detecte d as a source, the Large Magellanic Cloud, five pulsars, 40 high-confi dence identifications of active galactic nuclei (AGNs), II AGN identif ications with lower confidence, and 71 sources not yet identified with known objects. Also included are approximate upper limits for gamma-r ay sources at any point in the sky and information about sources liste d in the first EGRET catalog but not appearing in this one.