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Published online by Cambridge University Press: 25 May 2016
One of the most exciting recent developments in astrophysics is the detection of members of the blazar class of AGN at ~1 GeV by the EGRET instrument aboard the Compton Observatory. Although a weak detection of 3C 273 was obtained by the COS B mission, the very strong detection of 3C 279 by EGRET (Hartman et al. 1992) two months after launch was not anticipated.