Comparison of the bolometric light curve derived from the gri integration corrected by a constant (+0.26) accounting for the missing flux fraction (open green circles) and Lyman’s prescription, assuming different limit for the SBO dominated light curve phase, namely: g − r < −0.1 (blue crosses) and g − r < 0.3 (red plus). The black segment on the lower left of the plot represents the errorbar on absolute luminosity calibration due to the uncertainties on distance modulus and extinction.