LAT-detected Flat Spectrum Radio Quasars: Similarities and Differences
Flat Spectrum radio quasars (FSRQs) are among the brightest sources in the gamma-ray sky. They have several open questions in the Fermi era, including the location in the jet of their gamma-ray emitting regions, and the origin of spectral curvature seen in their LAT spectra. I will present the results of multi-wavelength campaigns on several of these sources and some modeling results that give at least hints of answers to these questions. I will argue that there are at least two types of flares seen from these sources: those which can be modeled by only variations in the electron distribution, and those where the variation of another parameter is required.