Rest-frame γ-ray (grey), X-ray (black) and optical (orange) luminosity. The red triangle shows the value of average isotropic γ-ray luminosity L_iso. Blue and green dotted lines represent the light curve best fit for the X-ray and optical bands, respectively. In addition: the last two panels are the rest-frame optical luminosity of the whole sample and the rest-frame optical luminosity, which are normalised by the isotropic energy (E_iso). The solid vertical line correspond to t_RF = 12 h.