Black curve: efficiency to detect core-collapse SN as a function of the distance to the SN assuming an absolute R-band magnitude of  − 18 ± 1. Shaded region: lower bound assuming an absolute magnitude of  − 17, upper bound assuming  − 19. The breaks in the shaded regions are connected to the binning in Fig. 9. The binning effect is washed out in the black curve due to the assumed uncertainty in the absolute magnitude distribution of  ± 1.