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We obtained 98 R-band and 18 B, r', i' images of the optical afterglow of GRB060526 (z=3.21) with the MDM 1.3m, 2.4m, and the PROMPT telescopes in CerroTololo over the 5 nights following the burst trigger. Combining these data withother optical observations reported in GCN and the Swift-XRT observations, wecompare the optical and X-ray afterglow light curves of GRB 060526. Both theoptical and X-ray afterglow light curves show rich features, such as flares andbreaks. The densely sampled optical observations provide very good coverage atT>1.e4 sec. We observed a break at 2.4e5 sec in the optical afterglow lightcurve. Compared with the X-ray afterglow light curve, the break is consistentwith an achromatic break supporting the beaming models of GRBs. However, thepre-break and post-break temporal decay slopes are difficult to explain insimple afterglow models. We estimated a jet angle of \theta_j ~ 7 degrees and aprompt emission size of R_{prompt} ~ 2e14 cm. In addition, we detected severaloptical flares with amplitudes of \Delta m ~ 0.2, 0.6, and 0.2 mag. The X-rayafterglows detected by Swift have shown complicated decay patterns. Recently,many well-sampled optical afterglows also show decays with flares and multiplebreaks. GRB 060526 provides an additional case of such a complex, well observedoptical afterglow. The accumulated well-sampled afterglows indicate that mostof the optical afterglows are complex.Comment: Accepted by ApJ, 21 pages, 4 figure

Optical and X‐Ray Observations of GRB 060526: A Complex Afterglow Consistent with an Achromatic Jet Break