Top panel: binned TESS light curve adopting a bin size of two hours and plotted vs. phase relative to JD 2458900. Over-plotted is our best-fit power law. Bottom panel: 2D probability density of the MCMC sample between the fit parameters – time of explosion, t_exp, and power-law index, α. The contours correspond to 68% and 95% confidence intervals. The solid intersecting black lines indicate the mean of the MCMC sample for parameters $t_{\exp }=\mathrm{JD}2458993.{64}_{-0.20}^{+0.23}$ (vertical) and $\alpha =1.{50}_{-0.01}^{+0.01}$ (horizontal).