Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4..107m&link_type=abstract
Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o
Physics
Scientific paper
The first 4.5 years of observations by the EGRET instrument on the Compton Gamma Ray Observatory have been used to construct a catalog of 57 sources of cosmic gamma rays at energies above 1 GeV. These sources are identified as: blazars (21), pulsars (5), the LMC, and 30 unidentified sources whose latitude distribution argues for a galactic origin. In this paper, we report on the preliminary extension of this work to approximately 7 years of observations with special emphasis on a search for transient sources. Sixteen new steady GeV sources are also detected, 3 of which have never been reported as gamma-ray sources. The search method and significance levels are presented. Our initial result on 22 possible transients indicates that 12 of them are new gamma-ray sources.
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