Where does over 99% of a core-collapse event's total energy escape?

Answer

Via neutrinos in the first few minutes

The energy output of the core collapse is overwhelmingly dominated by neutrinos, with more than 99% of the total energy released escaping the star within the first few minutes.

Where does over 99% of a core-collapse event's total energy escape?
physicsastronomystarssupernovacore collapse