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GRB 120308A, a long duration $\gamma-$ray burst detected by {\it Swift}, wasdistinguished by a highly-polarized early optical afterglow emission thatstrongly suggests an ordered magnetic field component in the emitting region.In this work we model the optical and X-ray emission in the reverse and forwardshock scenario and show that the strength of the magnetic field in reverseshock region is $\sim 10$ times stronger than that in the forward shock region.Consequently the outflow powering the highly-polarized reverse shock opticalemission was mildly-magnetized at a degree $\sigma \sim$ a few percent.Considering the plausible magnetic energy dissipation in both the accelerationand prompt emission phases of the Gamma-ray Burst (GRB) outflow, the afterglowdata of GRB 120308A provides us the compelling evidence that at least for someGRBs a non-ignorable fraction of the energy was released in the form ofPoynting-flux, confirming the finding firstly made in the reverse-forward shockemission modeling of the optical afterglow of GRB 990123 (Fan et al. 2002;Zhang et al. 2003).

The magnetization degree of the outflow powering the highly-polarized reverse shock emission of GRB 120308A