  We have observed 3C~279 in a gamma-ray flaring state in November 2008. We
construct quasi-simultaneous spectral energy distributions (SEDs) of the source
for the flaring period of 2008 and during a quiescent period in May 2010. Data
have been compiled from observations with Fermi, Swift, RXTE, the VLBA, and
various ground-based optical and radio telescopes. The objective is to
comprehend the correspondence between the flux and polarization variations
observed during these two time periods by carrying out a detailed spectral
analyses of 3C~279 in the internal shock scenario, and gain insights into the
role of intrinsic parameters and interplay of synchrotron and inverse Compton
radiation processes responsible for the two states. As a first step, we have
used a multi-slice time-dependent leptonic jet model, in the framework of the
internal shock scenario, with radiation feedback to simulate the SED of 3C~279
observed in an optical high state in early 2006. We have used physical jet
parameters obtained from the VLBA monitoring to guide our modeling efforts. We
briefly discuss the effects of intrinsic parameters and various radiation
processes in producing the resultant SED.
