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CGRaBS J0809+5341, a high redshift blazar at z = 2.144, underwent a giantoptical outburst on 2014 April 19 when it brightened by $\sim$5 mag and reachedan unfiltered apparent magnitude of 15.7 mag. This implies an absolutemagnitude of -30.5 mag, making it one of the brightest quasars in the Universe.This optical flaring triggered us to carry out observations during the decayingpart of the flare covering a wide energy range using the {\it NuclearSpectroscopic Telescope Array}, {\it Swift}, and ground based opticalfacilities. For the first time, the source is detected in $\gamma$-rays by theLarge Area Telescope onboard the {\it Fermi Gamma-Ray Space Telescope}. A highoptical polarization of $\sim$10\% is also observed. Using the Sloan DigitalSky Survey spectrum, accretion disk luminosity and black hole mass areestimated as $1.5 \times 10^{45}$ erg s$^{-1}$ and $10^{8.4}~M_{\odot}$respectively. Using a single zone leptonic emission model, we reproduce thespectral energy distribution of the source during the flaring activity. Thisanalysis suggests that the emission region is probably located outside thebroad line region, and the jet becomes radiatively efficient. We also show thatthe overall properties of CGRaBS J0809+5341 seems not to be in agreement withthe general properties observed in high redshift blazars up to now.

Awakening of The High Redshift Blazar CGRaBS J0809+5341