Observed i-band photometry of SN 2016adj in flux units (black symbols) vs. days relative to the estimated explosion epoch (JD–2457411.5 ± 2.5). Overplotted as a blue solid line is the SN Ib/c i-band template light curve presented by Taddia et al. (2015), scaled and shifted to match the light curve of SN 2016adj. The blue dashed lines corresponds to a 1-σ uncertainty error snake. The epoch of the inferred explosion time, t₀, is indicated by the vertical red solid line and assumes an i-band rise time of 21 days (see Taddia et al. 2015). The time difference between the inferred explosion date and the first i-band epoch is 2.5 days, which corresponds to the uncertainty of our estimated rise time.