THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 101:259-286, 1995 December

           THE SECOND EGRET CATALOG OF HIGH-ENERGY GAMMA-RAY SOURCES

     D. J. THOMPSON(1), D. L. BERTSCH, B. L. DINGUS(2), J. A. ESPOSITO(2),
      A. ETIENNE(3), C. E. FICHTEL, D. P. FRIEDLANDER(3), R. C. HARTMAN,
      S. D. HUNTER, D. J. KENDIG(3), J. R. MATTOX(4), L. M. McDONALD(3),
  C. von MONTIGNY(5), R. MUKHERJEE(2), P. V. RAMANAMURTHY(6), P. SREEKUMAR(2)
        NASA/Goddard Space Flight Center, Code 662, Greenbelt, MD 20771

            J. M. FIERRO, Y. C. LIN, P. F. MICHELSON, P. L. NOLAN,
                          S. K. SHRIVER, T. D. WILLIS
    W.W. Hansen Experimental Physics Laboratory and Department of Physics,
                    Stanford University, Stanford CA 94305

       G. KANBACH, H. A. MAYER-HASSELWANDER, M. MERCK, AND H.-D. RADECKE
              Max-Planck-Institut fur Extraterrestrische Physik,
                 Giessenbachstrasse, D-85748 Garching, Germany

                                 D. A. KNIFFEN
    Department of Physics, Hampden-Sydney College, Hampden-Sydney, VA 23943

                                      AND

                                 E. J. SCHNEID
               Grumman Aerospace Corporation, Bethpage, NY 11714


                                   ABSTRACT

        The second catalog of high-energy gamma-ray observations from the
     Energetic 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 an improved model of the diffuse Galactic gamma
     radiation.  The 129 sources in the catalog include one solar flare
     bright enough to be detected as a source, the Large Magellanic Cloud,
     five pulsars, 40 high-confidence identifications of active galactic
     nuclei (AGNs), 11 AGN identifications with lower confidence, and 71
     sources not yet identified with known objects.  Also included are
     approximate upper limits for gamma-ray sources at any point in the sky
     and information about sources listed in the first EGRET catalog but
     not appearing in this one.

     Subject headings: catalogs -- diffuse radiation -- gamma rays:
                       observations -- methods: data analysis

     (1) djt@egret.gsfc.nasa.gov.
     (2) Universities Space Research Association Research Associate.
     (3) Hughes STX.
     (4) Compton Observatory Science Support Center, operated
         by USRA. Present address: Astronomy Department,
         University of Maryland, College Park, MD.
     (5) NAS/NRC Research Associate.
     (6) NAS/NRC Senior Research Associate.