GRB 120729A: optical and X-ray (0.3–10 keV) light curves. BRcIc magnitudes have been transformed into gri using transformation equations from Jordi et al. (2006), see the main text for details. The optical data are host-subtracted and have been corrected for foreground and rest-frame extinction. Note that the errorbars are usually smaller than the size of the plotted symbols. All LCs have been fit with a broken power-law to determine the decay rate before (αν,1) and after (αν,2) and the break (Tν,B), as well as the timing of the break. α1 is approximately the same in the optical and X-ray, as well as the time of the break (TB ≈ 0.1 d). After the break the X-ray decays at a faster rate than the optical filters. In r and i we simultaneously fit a SN-component (i.e. a stretch and luminosity factor relative to a redshifted, k-corrected template LC). The paucity of optical points limits our analysis, however when fixing the stretch factor to s = 1.0 in both filters, we find luminosity factors of kr = 1.29 ± 0.19 and ki = 0.76 ± 0.11.
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