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We report early optical linear polarization observations of two gamma-raybursts made with the MASTER robotic telescope network. We found the minimumpolar- ization for GRB150301B to be 8% at the beginning of the initial stage,whereas we detected no polarization for GRB150413A either at the rising branchor after the burst reached the power-law afterglow stage. This is the earliestmeasurement of the polarization (in cosmological rest frame) of gamma-raybursts. The primary intent of the paper is to discover optical emission andpublish extremely rare (unique) high- quality light curves of the promptoptical emission of gamma-ray bursts during the non-monotonic stage of theirevolution. We report that our team has discovered the optical counterpart ofone of the bursts, GRB150413A.

Early polarization observations of the optical emission of gamma-ray bursts: GRB150301B and GRB150413A