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Gravitational waves (GW) can be emitted from coalescing neutron star (NS) andblack hole-neutron star (BH-NS) binaries, which are thought to be the sourcesof short hard gamma ray bursts (SHBs). The gamma ray fireballs seem to bebeamed into a small solid angle and therefore only a fraction of detectable GWevents is expected to be observationally coincident with SHBs. Similarlyultrahigh energy (UHE) neutrino signals associated with gamma ray bursts (GRBs)could fail to be corroborated by prompt gamma-ray emission if the latter isbeamed in a narrower cone than the neutrinos. Alternative ways to corroboratenon-electromagnetic signals from coalescing neutron stars are therefore all themore desirable. It is noted here that the extended X-ray tails (XRT) of SHBsare similar to X-ray flashes (XRFs), and that both can be attributed to anoff-axis line of sight and thus span a larger solid angle than the hardemission. It is proposed that a higher fraction of detectable GW events may becoincident with XRF/XRT than with hard gamma-rays, thereby enhancing thepossibility to detect it as a GW or neutrino source. Scattered gamma-rays,which may subtend a much larger solid angle that the primary gamma ray jet, arealso candidates for corroborating non-electromagnetic signals.

Wide Angle X-ray Sky Monitoring for Corroborating non-Electromagnetic Cosmic Transients