Distributions of host distances and sky locations for off-nuclear extragalactic transients without premerger detection. The searched probability at each candidate position is the cumulative posterior probability of all skymap pixels with probability densities equal to or higher than that of the pixel containing the candidate, calculated using ligo.skymap (L. P. Singer et al. 2016a, 2016b). Smaller values indicate that the candidate lies in a region more strongly favored by the GW sky localization. Based on the GW distance estimate, the shaded gray regions represent the mean estimated distance (93 Mpc) ±1σ, ±2σ, ..., ±5σ, where σ is the distance uncertainty (27 Mpc). The transparency decreases with increasing σ-multiple to visually emphasize the central region. Distance errors for the photometric redshift sample are derived by sampling the redshift posterior.