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We report the detection of high polarization in the first detailed opticallinear polarization measurements on the BL Lac object CGRaBS J0211+1051, whichflared in $\gamma$-rays on 2011 January 23 as reported by Fermi. Theobservations were made during 2011 January 30 - February 3 usingphoto-polarimeter mounted at the 1.2m telescope of Mt Abu InfraRedObservatory(MIRO). The CGRaBS J0211+1051 was detected to have $\sim21.05\pm0.41%$ degree of polarization (DP) with steady position angle (PA) at43$^\circ$ on 2011 January 30. During Jan 31 and Feb 1, while polarizationshows some variation, position angle remains steady for the night. Severalolarization flashes occurred during February 2 and 3 resulting in changes inthe DP by more than 4% at short time scales ($\sim$ 17 to 45 mins). A mildincrease in the linear polarization with frequency is noticed during the nightsof February 2 & 3. The source exhibited significant inter-night variations inthe degree of polarization (changed by about 2 to 9%) and position angle(changed by 2 to 22$^\circ$) during the five nights of observations. Theintra-night activity shown by the source appears to be related to turbulence inthe relativistic jet. Sudden change in the PA accompanied by a rise in the DPcould be indicative of the fresh injection of electrons in the jet. Thedetection of high and variable degree of polarization categorizes the source aslow energy peaked blazar.

Optical polarimetry of the blazar CGRaBS~ J0211+1051 from MIRO