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A broadband study of the high redshift blazar S5 0836+71 (z = 2.172) ispresented. Multi-frequency light curves show multiple episodes of X-ray and$\gamma$-ray flares, while optical-UV fluxes show little variations. During theGeV outburst, the highest $\gamma$-ray flux measured is (5.22 $\pm$ 1.10)$\times$ 10$^{-6}$ ph cm$^{-2}$ s$^{-1}$ in the range of 0.1-300 GeV, whichcorresponds to an isotropic $\gamma$-ray luminosity of (1.62 $\pm$ 0.44)$\times$ 10$^{50}$ erg s$^{-1}$, thereby making this as one of the mostluminous $\gamma$-ray flare ever observed from any blazar. A fast $\gamma$-rayflux rising time of $\sim$3 hours is also noticed which is probably the firstmeasurement of hour scale variability detected from a high redshift (z > 2)blazar. The various activity states of S5 0836+71 are reproduced under theassumption of single zone leptonic emission model. In all the states, theemission region is located inside the broad line region, and the optical-UVradiation is dominated by the accretion disk emission. The modeling parameterssuggests the enhancement in bulk Lorentz factor as a primary cause of the$\gamma$-ray flare. The high X-ray activity with less variable $\gamma$-raycounterpart can be due to emission region to be located relatively closer tothe black hole where the dominating energy density of the disk emission resultsin higher X-ray flux due to inverse-Compton scattering of disk photons.

The High Redshift Blazar S5 0836+71: A Broadband Study