New Gener. High-Energy Spectra of the Blazar 3C 279 with XMM-Newton and GLAST

We propose two 20 ksec XMMNewton observations of the Xray bright gammarayblazar 3Cvirgul279 simultaneous with GLAST/LAT. The main goal is to measure its Xrayproperties (spectrum, variability) in order to (1) improve our knowledge on theXray emission of the blazar, and (2) to supplement and correlate them tosimultaneous GLAST/LAT Gammaray observations (30 MeV300 GeV). SimultaneousGLAST observations of 3C 279 are guaranteed (assuming proper operation then).The highenergy data will be supplemented by groundbased measurements, addingfinally up to multifrequency spectra which have unprecedented accuracy and willextend up to highenergy gammarays. Such highquality SEDs will provide severeconstraints on their modeling and have the potential to discriminate among models. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]