The Gamma-ray Activity of the high-z Quasar 0836+71

The Fermi LAT detected an increase in gamma -ray activity of the quasar 0836+710 (z=2.17) in Spring 2011 that culminated in a sharp gamma -ray flare at the end of 2011 when the source reached a flux of 2.9 x 10 super(-6)phot s super(-1)cm super(-2)at 0.1-200 GeV. We monitor the quasar at optical wavelengths in photometric and polarimetric modes, at millimeter and centimeter wavelengths, and with the VLBA at 43 GHz. The optical brightness of the quasar increased by ~0.5 mag in R band and the degree of polarization oscillated between ~1% and ~6% during the highest gamma -ray state, while the position angle of polarization rotated by ~300[degrees]. We have identified in the VLBA images a strong, highly polarized component that moves with an apparent speed of ~20 c. The component emerged from the core in the beginning of the gamma -ray event and reached a flux maximum at the peak of the gamma -ray outburst. We present the results of a correlative analysis of variations at different wavelengths along with the kinematic parameters of the parsec scale jet. We discuss the location of the high gamma -ray emission in the relativistic jet, as well as the emission mechanisms responsible for gamma -ray production.