Multifrequency Observations of the Virgo Blazars 3C 273 and 3C 279 in   CGRO Cycle 8
  We report first observational results of multifrequency campaigns on the prominent Virgo blazars 3C 273 and 3C 279 which were carried out in January and February 1999. Both blazars are detected from radio to gamma-ray energies. We present the measured X- to gamma-ray spectra of both sources, and for 3C 279 we compare the 1999 broad-band (radio to gamma-ray) spectrum to measured previous ones. 
W. Collmar, S. Benlloch, J.E. Grove, R.C. Hartman, W.A. Heindl, A.   Kraus, H. Teraesranta, M. Villata, K. Bennett, H. Bloem...