Pre-discovery light curves of SN 2016cvk. The clear filter observations from the CHASE are in blue, and the other points are with Sloan filters from the DECam instrument. The open inverted triangles are upper limits, and the filled circles are detections. The larger triangles with a horizontal error bar indicate more profound upper limits derived from stacked frames within the temporal bar. The phases are relative to the V-band maximum (Matilainen et al., in prep.).