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S20A0023abst

S20A0023

We propose ToO observations of gravitational wave (GW) sources detected with LIGO and Virgo. The state-of-the-art GW detectors, LIGO and Virgo have detected the GW signal from a neutron star (NS) merger GW170817 on August 17 2017. The intense electromagnetic (EM) emission was associated with this event and our observation team J-GEM (Japanese collaboration for Gravitational-wave Electro-Magnetic follow-up) successfully detected and follow-upped this EM counterpart using Subaru HSC and MOIRCS, and found evidence of r-process nucleosynthesis in the ejecta of the merger. The third long-term operation (>12 months; O3) of LIGO and Virgo started in April 2019. GWs from an order of 10 NS–NS mergers are expected to be detected in O3. We plan to make EM follow-up observations with HSC, FOCAS, MOIRCS, IRCS, or HDS of Subaru Telescope in the framework of J-GEM to reveal the nature of NS merger. In particular, wide field and deep imaging capability of HSC will play a very unique role in searching for EM emission from GW sources in the world.

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