  In the molecular nanomagnet Fe$_{8}$ tunneling can occur from a metastable
state to an excited state followed by a transition to the ground state. This
transition is accompanied by an energy release of $115.6$GHz. We constructed an
experimental setup to measure whether this energy is released in the form of
thermal or electromagnetic energy. Contrary to a previous publication we find
no evidence for release of electromagnetic radiation. Our results for
transitions between the first and second excited states to the ground state are
consistent with a release of only thermal energy. This energy release extends
for a longer time for the second excited state than for the first excited
state.
