Fig. 1.

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Optical LCs of SN 2021ckj. The data were taken with the 1.82 m Copernico Telescope (triangles), NTT (circles), ZTF (filled squares), ATLAS (inverted triangles), and Pan-STARRS (diamonds). The R-band magnitudes in the NTT data have been converted into r-band magnitudes using the relation in Chonis & Gaskell (2008). The gray and black points show the r-band LCs of SNe 2019hgp (Gal-Yam et al. 2022) and 2021csp (Fraser et al. 2021), respectively, which have been plotted using their absolute magnitudes. Limiting magnitudes are indicated with arrows. All the magnitudes have been corrected with the Galactic extinction (E(B − V) = 0.027 and 0.019 mag for SNe 2021csp and 2019hgp, respectively; Schlafly & Finkbeiner 2011). The error bars for all data points have also been plotted, even though they are smaller than the sizes of the symbols in most cases.
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