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The current generation of very-high-energy $gamma-$ray (VHE; E above 30 GeV)detectors (MAGIC and H.E.S.S.) have recently demonstrated the ability to detectthe afterglow emission of GRBs. However, the GRB prompt emission, typicallyobserved in the 10 keV-10 MeV band, has so far remained undetected at higherenergies. Here, we investigate the perspectives of multi-messenger observationsto detect the prompt emission of short GRBs in VHE. Considering binary neutronstar mergers as progenitors of short GRBs, we evaluate the joint detectionefficiency of the Cherenkov Telescope Array (CTA) observing in synergy with thethird generation of gravitational wave detectors, such as the EinsteinTelescope (ET) and Cosmic Explorer (CE). In particular, we evaluate theexpected capabilities to detect and localize gravitational wave events in theinspiral phase and to provide an early warning alert able to drive the VHEsearch. We compute the amount of possible joint detections by consideringseveral observational strategies, and demonstrate that the sensitivities of CTAmake the detection of the VHE emission possible even if it is several ordersfainter than the one observed at 10 keV-10 MeV. We discuss the results in termsof possible scenarios of production of VHE photons from binary neutron starmergers by considering GRB prompt and afterglow emissions.

astronomy and astrophysics

Pre-merger alert to detect the very-high-energy prompt emission from  binary neutron-star mergers: Einstein Telescope and Cherenkov Telescope Array  synergy