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We present a detailed investigation of the flaring activity observed from aBL Lac object, S5 0716+714 , during its brightest ever optical state in thesecond half of January 2015. Observed almost simultaneously in the optical,X-rays and {\gamma}-rays, a significant change in the degree of opticalpolarization (PD) and a swing in the position angle (PA) of polarization wererecorded. A detection in the TeV (VHE) was also reported by the MAGICconsortium during this flaring episode. Two prominent sub-flares, peaking about5-days apart, were seen in almost all the energy bands. The multi-wavelengthlight-curves, spectral energy distribution (SED) and polarization are modeledusing the time-dependent code developed by Zhang et al. (2014). This modelassumes a straight jet threaded by large scale helical magnetic fields takinginto account the light travel time effects, incorporating synchrotron flux andpolarization in 3D geometry. The rapid variation in PD and rotation in PA aremost likely due to re-connections happening in the emission region in the jet,as suggested by the change in the ratio of toroidal to poloidal components ofmagnetic field during quiescent and flaring states.

Multi-wavelength study of flaring activity in BL Lac object S5 0716+714 during 2015 outburst