Comparison of the pre-maximum light curve of SN 2018bsz to those of SLSNe-I from the literature showing clear bumps before the main rise to maximum (iPTF13dcc is shown in open circles as its form is clearly distinct from the events). Next to each SLSN name in parenthesis we give the object redshift (in the bottom panel). Non-detection upper limits are indicated by upside down triangles. Top: light-curves normalised to maximum-light magnitude. Bottom: absolute magnitude light curves with respect to maximum light. SN 2018bsz is in the ATLAS o band, while all other comparison SNe are in observed R or r band. Given the range of redshifts of the SLSN comparison sample, these observed bands equate to different rest frame wavelengths. However, given the lack of a) multi-band photometry (to enable rest-frame band comparison) and b) spectra of SLSNe-I during these epochs (to allow for valid K-corrections) we prefer to plot the data in its “raw” form. Colour effects may complicate the direct comparison of these light curves.
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