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We present the results of the photometric multicolor observations of GRB060526 optical afterglow obtained with Russian-Turkish 1.5-m Telescope (RTT150,Mt. Bakirlitepe, Turkey). The detailed measurements of afterglow light curve,starting from about 5 hours after the GRB and during 5 consecutive nights weredone. In addition, upper limits on the fast variability of the afterglow duringthe first night of observations were obtained and the history of afterglowcolor variations was measured in detail. In the time interval from 6 to 16hours after the burst, there is a gradual flux decay, which can be describedapproximately as a power law with an index of -1.14+-0.02. After that thevariability on the time scale \delta t < t is observed and the afterglowstarted to decay faster. The color of the afterglow, V-R=~0.5, is approximatelythe same during all our observations. The variability is detected on timescales up to \delta t/t =~ 0.0055 at \Delta F_\nu/F_\nu =~ 0.3, which violatessome constraints on the variability of the observed emission fromultrarelativistic jet obtained by Ioka et al. (2005). We suggest to explainthis variability by the fact that the motion of the emitting shell is no longerultrarelativistic at this time.

Observations of GRB 060526 Optical Afterglow with Russian-Turkish 1.5-m Telescope