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Dietrich, M. Drozdz, M. Kamada, M. Kurpinska-Winiarska, M. Nissinen, M. Pasanen, M. Siwak, M. S. Peeples, M. Winiarski, N. Bergvall, P. Niarchos, R. J. Assef, S. A. Coggins-Hill, S. Dogru, S. Haque, T. Kundera, T. Pursimo, V.-P. Hentunen, W. C. Keel, W. Ogloza, X. Zhou, Y. Efimov","submitted_at":"2009-11-30T21:42:09Z","abstract_excerpt":"(Abridged) OJ287 is a BL Lac object that has shown double-peaked bursts at regular intervals of ~12 yr during the last ~40 yr. We analyse optical photopolarimetric monitoring data from 2005-2009, during which the latest double-peaked outburst occurred. The aim of this study is twofold: firstly, we aim to analyse variability patterns and statistical properties of the optical polarization light-curve. We find a strong preferred position angle in optical polarization. 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