2021ApJ...917...96S

We study an interstellar signaling scheme that was originally proposed by Seto and efficiently links intentional transmitters to extraterrestrial intelligence (ETI) searchers through a conspicuous astronomical burst, without prior communication. Based on the geometrical and game theoretic viewpoints, the scheme can be refined so that intentional signals can be sent and received after observing a reference burst, in contrast to the original proposal (before observing a burst). Given this inverted temporal structure, Galactic supernovae recorded in the past 2000 yr can be regarded as interesting guideposts for an ETI search. While the best use period of SN 393 has presumably passed ∼100 yr ago, some of the historical supernovae might allow us to compactify the ETI survey regions down to less than one present of 4π, around two rings in the sky.