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"Anomalous" Optical Gamma-Ray Burst Afterglows Are Common: Two <i>z</i> ~ 4 Bursts, GRB 060206 and GRB 060210
We report on two z ~ 4 gamma-ray bursts, GRB 060206 and GRB 060210, for which we have obtained well-sampled optical light curves. Both light curves show unusual behavior. GRB 060206 experienced a slow early decay, followed by a rapid increase in brightness by factor 2.5 about 1 hr after …