SN luminosity factor k (peak luminosity in units of SN 1998bw’s peak luminosity) vs. stretch factor s (time dilation vs. SN 1998bw’s peak time) in the quasi V band. Quasi rest-frame V band means that the observed bandpass partly overlaps with the rest-frame V band. Low-L GRBs are highlighted by diamonds, high-L GRBs by squares, and the intermediate-L GRB 120422A by a star. References: Ferrero et al. (2009): GRBs 020903, 030329, 031203, 060218, Kann (in priv. comm.): GRBs 091127 and 100316D, here: GRBs 120422A and 130427A.