Circularly Polarized EM Radiation from GW Binary Sources
  We consider the polarization characteristics of the electromagnetic (EM)
counterpart of the gravitational wave (GW) created by coalescence of the binary
sources. Here, we explore the impact of the photon-graviton interaction on the
polarization evolution of X-ray emission of GammaRay Bursts (GRBs). We show
that significant circular polarization can be generated due to the
gravitational wave from the binary merger. The circular polarization besides
photon energy depends on parameters of GW source such as the chirp mass of the
binary, frequency of the GWs and radial distance from the source. Our predicted
signal can be used as an indirect probe for GW events and also the nature of
photon-graviton interaction. We argue that this polarization signal might be in
sensitivity range of upcoming X-ray polarimetry missions.
