NASA NTRS · 19930044902
EGRET observations of 3C 273
Abstract
The quasar 3C 273 was detected by COS-B in the 1970's. EGRET observations of this sky region in June and October 1991 revealed a flux from 3C 273 lower than that measured by COS-B. The flux observed by EGRET in the June period is approximately 3 x 10 exp -7/sq cm s for energies greater than 100 MeV. During the October observation it appears to be even lower. For the first observation a preliminary spectrum which has a photon index of 2.4 has been derived.
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Von Montigny, C., Bertsch, D. L., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Kwok, P. W., Lin, Y. C., Mattox, J. R.. 1993-01-01. EGRET observations of 3C 273. https://ntrs.nasa.gov/citations/19930044902
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