Long GRBs and massive stellar explosions from frame dragging around rotating black holes

Abstract

The most energetic GRB-supernovae probably derive from rotating stellar mass black holes. Based on BeppoSax data, we identify a mechanism for exploding a remnant stellar envelope by disk winds. A specific signature is high frequency modulations in the accompanying prompt GRB emission from dissipation in high energy emissions along the black hole spin axis due, in part, to forced turbulence in the inner disk or torus mediated by frame dragging. A majority of long GRBs are found to have significant autocorrelation below 10 Hz with chirps extending up to 1000 Hz. Their comoving Fourier spectra satisfy a power law with index $\alpha\simeq-0.82$ up to about one hundred Hz and comoving chirp spectra show broken power laws with $\alpha\simeq-0.65$ up to 10 Hz, $\alpha\simeq-0.25$ up to a few hundred Hz and $\alpha\simeq0$ beyond. These high frequency signatures are the most direct signature of long-lived turbulence down to the ISCO of rotating black holes, pointing directly accompanying long duration bursts in gravitational wave emission.