Early light curve of SN 2020nlb shown in apparent magnitude scale. The coloured dashed lines represent the power-law fits to the earlier data described in the main text. The earlier upper limit is in the ATLAS-cyan filter, and the second later upper limit is from the Itagaki Astronomical Observatory’s 0.35 m telescope reported in Sand et al. (2021). No offset has been applied to any of the photometric data here, so it is easier to visually interpret the upper limits, which are in different filters to the detections.