  Hard photon emitted from energetic heavy ion collisions is of very
interesting since it does not experience the late-stage nuclear interaction,
therefore it is useful to explore the early-stage information of matter phase.
In this work, we have presented a first calculation of azimuthal asymmetry,
characterized by directed transverse flow parameter $F$ and elliptic asymmetry
coefficient $v_2$, for proton-neutron bremsstrahlung hard photons in
intermediate energy heavy-ion collisions. The positive $F$ and negative $v_2$
of direct photons are illustrated and they seem to be anti-correlated to the
corresponding free proton's flow.
