GRB 130831A: optical (Rciz) light curves. The solid lines in each filter are the sum of the AG and SN components. The optical data have been corrected for foreground extinction, and the Rc and i are host-subtracted (see the text). The z data have not been host-subtracted because of the lack of observations of the host in z at late times. All LCs are well fit with a single PL, and we assume that the LCs decay at the same rate in all filters, where α = 1.63 ± 0.02. A clear SN bump is seen in Rc and i, and a flattening of the LC is seen in z, which can be attributed to flux coming from SN 2013fu. In each filter we simultaneously fitted a SN-component to determine the stretch (s) and luminosity (k) factors in each filter. Because of the lack of observations in z at late times, we fixed the value of stretch factor to be the same in i and z (i.e. si ≡ sz). Our best-fitting parameters are kR = 0.65 ± 0.03 and sR = 0.84 ± 0.03; ki = 1.04 ± 0.05 and si = 0.81 ± 0.03; kz = 1.02 ± 0.19 and sz = si = 0.81 (fixed). As the z data are not host-subtracted, the luminosity factor is an upper limit to the maximum brightness of SN 2013fu in this filter.
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