DETECTION OF HIGH-ENERGY GAMMA-RAYS FROM QUASAR PKS 0528-GAMMA-RAY-OBSERVATORY(134 BY EGRET ON THE COMPTON)

The first several pointing directions of the Compton Gamma Ray Observa tory, launched on 1991 April 5, were toward the Galactic anticenter. I n addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Ge minga (2CG 195 + 04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gam ma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law wi th an exponent of 2.56 +/- 0.09 and a photon intensity above 100 MeV o f (8.4 +/- 1.0) x 10(-7) photons cm-2 s-1. There is evidence for time variability on a time scale of a few days.