  We calculate timelike virtual Compton scattering amplitudes in the
generalized Bjorken scaling regime and focus on a new polarization asymmetry in
the scattering process with a linearly polarized photon beam in the medium
energy range, which will be studied intensely at JLab12 experiments. We
demonstrate that new observables help us to access the polarized quark and
gluon generalized parton distributions $\tilde H(x, \xi, t)$ and $ \tilde E(x,
\xi, t)$.
