Bolometric light curve of SN 2018ibb from 1800 to 14 300 Å (rest-frame). The dotted lines indicate time segments with partial wavelength coverage. At peak SN 2018ibb reached a luminosity of > 2 × 10⁴⁴ erg s⁻¹. Integrating over the light curve from t_max–93 to t_max+706 days yields a radiated energy of 3 > ×10⁵¹ erg. Both values are conservative lower limits. The inset shows the evolution of the blackbody temperature and radius of the photospheric phase where photometry has been carried out from the u to H bands. The shaded regions indicate the 1σ statistical uncertainties.