Abstract. Blazars are the subclass of AGNs showing very fast variations in all the wavebands (ranging from radio to VHE gamma rays). We have monitored this source during five nights in March 2010. Almost all the five nights are showing the bright state of source as well as significant variation (∼0.1 mag during ∼3 hours). During two out of five nights we can see very rapid rise and decay in intensity (approx 0.07 mag during 15 min). Several models are proposed to explain such kind of fast variability. The shock acceleration in the jet seems to be better to explain the observed behavior during the monitoring period.