  We consider low angular momentum, neutrino cooled accretion flows onto
newborn black holes in the context of the collapsar model for long Gamma Ray
Bursts, and find a considerable energy release for rotation rates lower than
those usually considered. The efficiency for the transformation of
gravitational binding energy into radiation is maximized when the equatorial
angular momentum l0 ~ 2 Rg c, where Rg is the Schwarzschild radius.
