  The timing performance of silicon sensors bump-bonded to Timepix3 ASICs is
investigated, prior to and after different types of irradiation up to $8 \times
10^{15} 1 \mathrm{\,Me\kern -0.1em V} \mathrm{ \,n_{eq}} {\mathrm{
\,cm}}^{-2}$. The sensors have been tested with a beam of charged particles in
two different configurations, perpendicular to and almost parallel to the
incident beam. The second approach, known as the grazing angles method, is
shown to be a powerful method to investigate not only the charge collection,
but also the time-to-threshold properties as a function of the depth at which
the charges are liberated.
