The Search for Extra-Galactic Intelligence Signals Synchronized with Binary Neutron Star Mergers

Abstract

We discuss the possibility of receiving a radio signal from extra-Galactic intelligence, around the time when we observe a binary neutron star merger in their galaxy. High-precession measurements of the binary parameters would allow them to send the signal ∼10 4 years before they themselves observe the merger signal. Using the SKA, we might receive ∼10 4 bits of data, transmitted from 40 Mpc away with an output power of ∼1TW. We also discuss related topics for GW170817 and mention potential roles of future gravitational wave detectors in relation to this transmission scheme.