Optical and X-ray light curve of SN 2020bvc. X-ray (Swift-XRT and CXO, 0.3–10 keV) data are plotted in black, while Swift-UVOT data are represented with colored circles (Table C.1). Zwicky Transient Facility (ZTF, Graham et al. 2019; Bellm et al. 2019) g and r data (Table C.2) are shown as triangles. We also indicate the detection and the last non-detection by the ASAS-SN survey. Time is relative to the estimated epoch of SN explosion (see Sect. 4), shown with a gray dashed line. The epochs of the FLOYDS and SPRAT spectra are shown in gray and blue.