GRB 120729A: optical and X-ray (0.3–10 keV) light curves. BR_cI_c 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 (α_ν,1) and after (α_ν,2) and the break (T_ν,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 (T_B ≈ 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 k_r = 1.29 ± 0.19 and k_i = 0.76 ± 0.11.