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Long gamma-ray bursts (GRBs) associated with supernovae and short GRBs withExtended Emission (SGRBEE) from mergers are probably powered by black holes asa common inner engine, as their prompt GRB emission satisfies the same Amaticorrelation in the $E_{p,i}-E_{iso}$ plane. We introduce modified Bardeenequations to identify hyper-accretion driving newly formed black holes incore-collapse supernovae to near-extremal spin as a precursor to prompt GRBemission. Subsequent spin-down is observed in the BATSE catalog of long GRBs.Spin-down provides a natural unification of long durations associated with thelifetime of black hole spin for normal long GRBs and SGRBEEs, given the absenceof major fallback matter in mergers. The results point to major emissionsunseen in high frequency gravitational waves. A novel matched filtering methodis described for LIGO-Virgo and KAGRA broadband probes of nearby core-collapsesupernovae at essentially maximal sensitivity.

Near-extremal black holes as initial conditions of long GRB-supernovae and probes of their gravitational wave emission