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Aims. The observation of gamma -ray flares from blazar 0836+710 in 2011,following a period of quiescence, offered an opportunity to study correlatedactivity at different wavelengths for a high-redshift (z=2.218) active galacticnucleus. Methods. Optical and radio monitoring, plus Fermi-LAT gamma-raymonitoring provided 2008-2012 coverage, while Swift offered auxiliary optical,ultraviolet, and X-ray information. Other contemporaneous observations wereused to construct a broad-band spectral energy distribution. Results. There isevidence of correlation but not a measurable lag between the optical andgamma-ray flaring emission. On the contrary, there is no clear correlationbetween radio and gamma-ray activity, indicating radio emission regions thatare unrelated to the parts of the jet that produce the gamma-rays. Thegamma-ray energy spectrum is unusual in showing a change of shape from a powerlaw to a curved spectrum when going from the quiescent state to the activestate.

Long-Term Multiwavelength Studies of High-Redshift Blazar 0836+710