This supplement extends the second EGRET catalog of high-energy gamma-ray sources (see recent paper by Thompson et al.), incorporating data from 1993 September to 1994 October. The second catalog contained 129 sources, based on data from 1991 April to 1993 September. An additional 28 sources are found, including three new identifications of active galactic nuclei.
Cone search capability for table J/ApJS/107/227/table1 (EGRET Viewing Periods: Phase 3)
Cone search capability for table J/ApJS/107/227/table2 (Supplement to the Second EGRET Source Catalog)