  We apply Brunetti and Fredenhagen's [Phys. Rev. A 66 (2002) 044101] concept
of the time of occurrence of an event in quantum mechanics to the example of
scattering off a spherical potential. Thereby, we re-derive the expression of
Froissart, Goldberger, and Watson [Phys. Rev. 131 (1963) 2820] for the angular
time delay, clarifying some conceptual issues with their derivation. We also
present an elementary re-derivation of the "space shift" (essentially the
impact parameter) defined in the quantum mechanical context by the same
authors. We clarify the relation of both quantities to their classical
counterparts in the context of the WKB approximation. As an example, we apply
the concepts to scattering at a hard sphere. We find pronounced peaks in the
both the time delay and the space shift at the minima of intensity in the
forward diffraction region for short wavelength scattering and discuss whether
these could in principle be observable.
