  In-situ X-ray diffraction was used to investigate the structural
rearrangements during annealing from 77 K up to the crystallization temperature
of $\mathit{Cu_{44}Zr_{44}Al_8Hf_2Co_2}$ bulk metallic glass rejuvenated by
high pressure torsion performed at cryogenic temperatures and at room
temperature. The structural evolution was evaluated by dynamic mechanical
analysis as well as by differential scanning calorimetry to determine
relaxation dynamics and crystallization behaviour. Using a measure of the
configurational entropy calculated from the X-ray pair correlation function the
structural footprint of the deformation-induced rejuvenation in bulk metallic
glass is revealed. With synchrotron radiation temperature and time resolutions
comparable to calorimetric experiments are possible. This opens new
experimental possibilities allowing to unambiguously correlate changes in
atomic configuration and structure to calorimetrically observed signals and can
attribute those to changes of the dynamic and vibrational relaxations in glassy
materials. The results confirm that the structural footprint of the
$\mathit{\beta}$-transition is related to entropic relaxation with
characteristics of a first-order transition. The DMA data shows that in the
range of the $\mathit{\beta}$-transition non-reversible structural
rearrangements are preferentially activated. The low temperature
$\mathit{\gamma}$-transition is mostly triggering reversible deformations and
shows a change of slope in the entropic footprint with second order
characteristics.
