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We report first observational results of multifrequency campaigns on theprominent Virgo blazars 3C 273 and 3C 279 which were carried out in January andFebruary 1999. Both blazars are detected from radio to gamma-ray energies. Wepresent the measured X- to gamma-ray spectra of both sources, and for 3C 279 wecompare the 1999 broad-band (radio to gamma-ray) spectrum to measured previousones.Comment: 5 pages including 3 figures, latex2e, to appear in: 'Proc. of the 5th  Compton Symposium', AIP, in pres

Multifrequency observations of the Virgo blazars 3C 273 and 3C 279 in CGRO cycle 8