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We present first results on polarization swings in optical emission ofblazars obtained by RoboPol, a monitoring program of an unbiased sample ofgamma-ray bright blazars specially designed for effective detection of suchevents. A possible connection of polarization swing events with periods of highactivity in gamma rays is investigated using the dataset obtained during thefirst season of operation. It was found that the brightest gamma-ray flarestend to be located closer in time to rotation events, which may be anindication of two separate mechanisms responsible for the rotations. Blazarswith detected rotations have significantly larger amplitude and fastervariations of polarization angle in optical than blazars without rotations. Oursimulations show that the full set of observed rotations is not a likelyoutcome (probability $\le 1.5 \times 10^{-2}$) of a random walk of thepolarization vector simulated by a multicell model. Furthermore, it is highlyunlikely ($\sim 5 \times 10^{-5}$) that none of our rotations is physicallyconnected with an increase in gamma-ray activity.

RoboPol: First season rotations of optical polarization plane in blazars