We applied matched filtering to the light curves of 1491 long GRBs in the BATSE catalogue to search
for evidence of spindown of rapidly rotating black holes and (proto-)neutron stars. On average, the
results favor black hole spindown against high density matter at the ISCO. As a natural and common
outcome of core-collapse of massive stars and mergers, this model accounts for GRBs in- and outside
star forming regions. It also accounts for hyper-energetic GRB-SNe whose energy requirements exceed
the maximal spin-energy of rapidly rotating neutron stars. Hyper-energetic CC-SNe hereby provide
novel priors to LIGO-Virgo and KAGRA searches for long duration gravitational wave bursts up to tens
of seconds with an anticipated negative chirp by expansion of the ISCO.