Position estimation of galactic supernova based on gravitational wave and neutrino observations

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Abstract:: If a core-collapse supernova occurs in our galaxy, many telescopes will detect signals from it, including neutrino and gravitational wave detectors. These two detector types will catch signals earlier than electromagnetic telescopes, and will send alerts to other observatories. So that the onset of the electromagnetic radiation from the supernova is not missed, it is important for these detectors to determine the precise location of the supernova. However, gravitational wave detectors and neutrino detectors have relatively low angular resolution compared with electromagnetic telescopes. For example, the world largest water Cherenkov neutrino detector, Super Kamiokande, estimate the location of a supernova at the Galactic Center with an error size of about 5 deg. Moreover, as a matter of principle, no single gravitational wave detector is able to estimate the direction of the source at all, and a gravitational wave detector network must be used. In my talk, I will show typical values of the probability distribution of supernova position estimated from neutrino and gravitational wave data, and discuss the possibility of reducing the size of the estimated area by combining both data sets.