  The first measurement of the $\vec{^3He}(\vec{\gamma},p)d$ process was
performed at the High Intensity $\gamma$-ray Source (HI$\gamma$S) facility at
Triangle Universities Nuclear Laboratory (TUNL) using a circularly polarized,
monoenergetic $\gamma$-ray beam and a longitudinally polarized $^3$He target.
The spin-dependent asymmetry and the contribution from the two-body
photodisintegration to the $^3$He Gerasimov-Drell-Hearn integrand are extracted
and compared with state-of-the-art three-nucleon system calculations at the
incident photon energy of 29.0 MeV. The data are in general agreement with the
various theoretical predictions based on the Siegert theorem or on explicit
inclusion of meson-exchange currents.
