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The quasar 3C279 was the target of an extensive multiwavelength monitoringcampaign from January through April 2006, including an optical-IR-radiomonitoring campaign by the Whole Earth Blazar Telescope (WEBT) collaboration.In this paper we focus on the results of the WEBT campaign. The sourceexhibited substantial variability of optical flux and spectral shape, with acharacteristic time scale of a few days. The variability patterns throughoutthe optical BVRI bands were very closely correlated with each other. Inintriguing contrast to other (in particular, BL Lac type) blazars, we find alag of shorter- behind longer-wavelength variability throughout the RVB ranges,with a time delay increasing with increasing frequency. Spectral hardeningduring flares appears delayed with respect to a rising optical flux. This, incombination with the very steep IR-optical continuum spectral index of ~ 1.5 -2.0, may indicate a highly oblique magnetic field configuration near the baseof the jet. An alternative explanation through a slow (time scale of severaldays) acceleration mechanism would require an unusually low magnetic field of <0.2 G, about an order of magnitude lower than inferred from previous analysesof simultaneous SEDs of 3C279 and other FSRQs with similar properties.

The WEBT Campaign on the Blazar 3C279 in 2006