  We compile a catalog of 578 highly probable and 62 likely red supergiants
(RSGs) of the Milky Way, which represents the largest list of Galactic RSG
candidates designed for continuous follow-up to date. We match distances
measured by Gaia DR3, 2MASS photometry, and a 3D Galactic dust map to obtain
luminous bright late-type stars. Determining the stars' bolometric luminosities
and effective temperatures, we compare to Geneva stellar evolution tracks to
determine likely RSG candidates, and quantify contamination using a catalog of
Galactic AGB in the same luminosity-temperature space. We add details for
common or interesting characteristics of RSG, such as multi-star system
membership, variability, and classification as a runaway. As potential future
core-collapse supernova (SN) progenitors, we study the ability of the catalog
to inform the Supernova Early Warning System (SNEWS) coincidence network made
to automate pointing, and show that for 3D position estimates made possible by
neutrinos, the number of progenitor candidates can be significantly reduced,
improving our ability to observe the progenitor pre-explosion and the early
phases of the core-collapse supernova.
