Example of the time-of-explosion determination. We fitted an inverse exponential model (Eq. (8)) to the observed flux curves (black error bars), modelling the available bands (here g and r) jointly with a shared explosion time t₀. The coloured bands (cyan for g, red for r) show the 95% confidence regions of the fits. The bottom panel displays the t₀ posterior along with the inferred value relative to the first detection and its uncertainty. Finally, the inflated flux errors, including the additional fitted uncertainty σ_add, are shown in grey. Here, the reported g-band uncertainties accurately capture the scatter around the model, resulting in minimal error inflation. In contrast, the r-band errors show noticeable inflation, with σ_add around 0.06 mag.