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The next Galactic supernova is expected to bring great opportunities for thedirect detection of gravitational waves (GW), full flavor neutrinos, andmulti-wavelength photons. To maximize the science return from such a rareevent, it is essential to have established classes of possible situations andpreparations for appropriate observations. To this end, we use a long-termnumerical simulation of the core-collapse supernova (CCSN) of a 17 solar-massred supergiant progenitor to self-consistently model the multi-messengersignals expected in GW, neutrino, and electromagnetic messengers. Thissupernova model takes into account the formation and evolution of aprotoneutron star, neutrino-matter interaction, and neutrino transport, allwithin a two-dimensional shock hydrodynamics simulation. With this, weseparately discuss three situations: (i) a CCSN at the Galactic Center, (ii) anextremely nearby CCSN within hundreds of parsecs, and (iii) a CCSN in nearbygalaxies within several Mpc. These distance regimes necessitate differentstrategies for synergistic observations. In a Galactic CCSN, neutrinos providestrategic timing and pointing information. We explore how these in turn deliveran improvement in the sensitivity of GW analyses and help to guaranteeobservations of early electromagnetic signals. To facilitate the detection ofmulti-messenger signals of CCSNe in extremely nearby and extragalacticdistances, we compile a list of nearby red supergiant candidates and a list ofnearby galaxies with their expected CCSN rates. By exploring the sequentialmulti-messenger signals of a nearby CCSN, we discuss preparations formaximizing successful studies of such an unprecedented stirring event.

Multi-messenger signals of long-term core-collapse supernova simulations : synergetic observation strategies