Top: Pan-STARRS 3-color gri images of a subset of candidates with grades ≥2 from visual inspection of CNN scores p_CNN > 0.9 (the complete figure is available in Appendix A). Numbers displayed on top of each panel are CNN scores (p_CNN, left) and average visual grades (right). Candidates with PS1 names marked in orange have been previously published in the literature (see Table 1 and Sect. 6.1) Those marked in blue show unambiguous spectral signatures of high-redshift background sources in our inspection of SDSS BOSS DR16 data. Bottom: examples of random false positives with p_CNN = 1. All cutouts are 15″ × 15″.