Exponential fit on the ROTSE light curve of SN 2008in (left) and the ZTF early light curves of SN 2020jfo (right). The blue shaded areas shows the obtained t₀ posteriors. The black curves show the mean fit, namely, the fit that results by taking the mean of the posterior distributions. In case of SN 2020jfo, the g-band light curve was further rescaled after the normalization to improve clarity on the figure. The shaded regions denote the 68% and 95% confidence intervals.