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Binary black-holes (BHs) and binary neutron-stars (NSs) mergers had beenrecently detected through gravitational-wave (GW) emission, with the latterfollowed by post-merger electromagnetic counterparts, appearing seconds up toweeks after the merger. While post-merger electromagnetic counterparts had beenanticipated theoretically, very little electromagnetic precursors to GW-sourceshad been proposed, and non observed yet. Here we show that a fraction of ${\rma}\,{\rm few\times}10^{-4}-10^{-1}$ of LIGO GW-sources and short-GRBs, could bepreceded by supernovae-explosions years up to decades before the merger. Eachof the BH/NS-progenitors in GW-sources are thought to form following asupernova, likely accompanied by a natal velocity-kick to the newly borncompact object. The evolution and natal-kicks determine the orbits of survivingbinaries, and hence the delay-time between the birth of the compact-binary andits final merger through GW-emission. We use data from binary evolutionpopulation-synthesis models to show that the delay-time distribution has anon-negligible tail of ultra-short delay-times between 1-100 yrs, therebygiving rise to potentially observable supernovae precursors to GW-sources.Moreover, future LISA/DECIGO GW space-detectors will enable the detection ofGW-inspirals in the pre-mergers stage weeks to decades before the final merger.These ultra-short delay-time sources could therefore produce a unique type ofpromptly appearing LISA/DECIGO-GW-sources accompanied by \emph{coincident}supernovae. The archival (and/or direct) detection of precursor (coincident)SNe with GW and/or short-GRBs will provide unprecedented characterizations ofthe merging-binaries, and their prior evolution through supernovae and natalkicks, otherwise inaccessible through other means.

Supernova and prompt gravitational-wave precursors to LIGO gravitational-wave sources and short-GRBs