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The BATSE catalogue is searched for evidence of spindown of black holes orproto-neutron stars (PNS) by extracting normalized light curves (nLC). The nLCare obtained by matched filtering, to suppress intermediate time scales such asdue to the shock break-out of GRB jets through a remnant stellar envelope. Wefind consistency within a few percent of the nLC and the model template forspindown of an initially extremal black hole against high-density matter at theISCO. The large BATSE size enables a study of the nLC as a function ofdurations $T_{90}$. The resulting $\chi^2_{red}$ is within a $2.35\sigma$confidence interval for durations $T_{90}>20$ s, which compares favorably withthe alternative of spindown against matter further out and spindown of a PNS,whose $\chi^2$ fits are, respectively, outside the 4$\sigma$ and 12$\sigma$confidence intervals. We attribute spindown against matter at the ISCO tocooling by gravitational-wave emission from non-axisymmetric instabilities inthe inner disk or torus as the result of a Hopf bifurcation in response toenergetic input from the central black hole. This identification gives anattractive outlook for chirps in quasi-periodic gravitational waves lastingtens of seconds of interest to LIGO, Virgo and the LCGT.

Discovery of black hole spindown in the BATSE catalogue of long GRBs