Extended Data Fig. 6: Light curve fit using a 56Ni-powered model.
From: A kilonova following a long-duration gamma-ray burst at 350 Mpc
This provides a poor fit, as the single radioactive component is unable to cool quickly enough to match the early UV and longer-term NIR emission. The best-fitting parameters require an unrealistic composition of 100% 56Ni and an ejecta velocity pushing against the upper bound of the prior at 0.4c.
