Cumulative fraction, f_d, of astrophysical neutrino sources with a single high-energy neutrino detection in IceCube, accumulated as a function of source redshift, assuming they follow the SFR (Madau & Dickinson 2014) given standard cosmology. The redshift of PS16cgx is marked with a vertical line. The maximum distance ranges where a normal Type Ic (squares) and Type Ic-BL (circles) SNe can be detected in rise are indicated assuming negligible line-of-sight extinction, ignoring K-corrections, and adopting 1σ distribution of the SN peak magnitudes, for image depths of 22.5 and 25 mag (white and grey symbols, respectively).