Optical and X-ray light curves of GRB 061121 afterglows. The abscissa denote the time since the GRB trigger in seconds. In the top panel, the ordinate denotes the flux density in mJy for optical data and the count rate for X-ray data observed with XRT. Our observations and X-ray observations by XRT are indicated by the filled circles and crosses, respectively. Open circles and squares are optical observations with Rc and V/White light (UVOT) bands reported to GCN or taken by UVOT, respectively. The solid lines are 95% confidence regions of the best-fitted power-law models for optical light curves. The labels, a), b), c), d), and e) represent the time intervals for the SED analysis (see Sect. 3.2). In the bottom panel, the ordinate denotes the ratio of the observed flux density to the best-fitted model of the plateau phase. V band points are shifted by −0.05 to match the Rc band points.
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