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We compile a catalog of 598 highly probable and 79 likely red supergiants(RSGs) of the Milky Way, which represents the largest list of Galactic RSGcandidates to date. We matched distances measured by Gaia DR3, 2MASSphotometry, and a 3D Galactic dust map to obtain luminous bright late-typestars. Determining the stars' bolometric luminosities and effectivetemperatures, we compared to Geneva stellar evolution tracks to determinelikely RSG candidates, and quantified contamination using a catalog of GalacticAGB in the same luminosity-temperature space. We add details for common orinteresting characteristics of RSG, such as multi-star system membership,variability, and classification as a runaway. As potential future core-collapsesupernova (SN) progenitors, we studied the ability of the catalog to inform theSupernova Early Warning System (SNEWS) coincidence network made to automatepointing, and show that for 3D position estimates made possible by neutrinos,the number of progenitor candidates can be significantly reduced, improving ourability to observe the progenitor pre-explosion and the early phases of thecore-collapse supernova.

Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova