A Dual-Burst Geometrical Prescription for Concurrent Signaling
We propose a dual-burst implementation of concurrent signaling for technosignature searches. Concurrent signaling is a Schelling-point prescription for implicit coordination between transmitters and receivers without prior communication, using salient astronomical phenomena as coordination anchors. It allows possible transmitters at different line-of-sight distances to be searched collectively through a time-dependent locus on the sky. In the dual-burst implementation, the coordination anchors are two cosmological transients. At a chosen observing time after the later burst, the leading geometrical prescription specifies a precisely defined sky ring from the two burst directions and their observed arrival times at the receiver. No distance to either burst, to a candidate transmitter, or to a Galactic spatial anchor is required to construct this angular search locus. The finite width of the ring is therefore controlled primarily by burst localization rather than by an astrophysical distance scale, thereby reducing the set of sky directions to be searched.