Passive and active seti strategies using the synchronization of SN1987A

This is a SETI search strategy often called the “SETI ellipsoid”. It’s the same as “light echos” used to map the interstellar medium around supernovae, but instead traces technosignature rebroadcasts of events. e.g. https://t.co/D7uUFq2n2Q

@david_kipping @alexteachey also, the idea reminds me of the timing of SETI signals @ key times, e.g. SNe: https://t.co/9CEsk67y6j