Neutrino Luminosity at Bounce and the Energy Partition of a Collapsing Core

Almost all of the energy of a core-collapse event leaves as neutrinos, distributed very unevenly in time. This paper partitions a representative neutrino light curve into collapse, burst, accretion and cooling phases and computes each phase share of the total radiated energy. Using the calculation described in the Methods, the headline results are: total_neutrino_E_erg = 3.19e+53, burst_share_pct = 1.1, cooling_share_pct = 84.5, burst_peak_L_erg_s = 3.5e+53. The brief bounce burst dominates instantaneous luminosity yet contributes only about one percent of the total energy, while the long cooling tail contributes the majority. Detectors weight these phases differently: burst counts probe peak physics, whereas total counts probe the cooling integral. Conflating the two leads to incorrect inferences about remnant binding energy from burst statistics alone. This study is simulated and computed from stated assumptions; it is not a measurement. All headline numbers in this abstract appear in the deposited results file and are reproduced by running the deposited code without modification.