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We present our optical follow-up observations to search for anelectromagnetic counterpart of the first gravitational wave source GW150914 inthe framework of the Japanese collaboration for Gravitational waveElectroMagnetic follow-up (J-GEM), which is an observing group utilizingoptical and radio telescopes in Japan, as well as those in New Zealand, China,South Africa, Chile, and Hawaii. We carried out a wide-field imaging surveywith Kiso Wide Field Camera (KWFC) on the 1.05-m Kiso Schmidt telescope inJapan and a galaxy-targeted survey with Tripole5 on the B&C 61-cm telescope inNew Zealand. Approximately 24 deg2 regions in total were surveyed in i-bandwith KWFC and 18 nearby galaxies were observed with Tripole5 in g-, r-, andi-bands 4-12 days after the gravitational wave detection. Median 5-sigma depthsare i~18.9 mag for the KWFC data and g~18.9 mag, r~18.7 mag, and i~18.3 mag forthe Tripole5 data. Probability for a counterpart to be in the observed area is1.2% in the initial skymap and 0.1% in the final skymap. We do not find anytransient source associated to an external galaxy with spatial offset from itscenter, which is consistent with the local supernova rate. We summarize futureprospects and ongoing efforts to pin down electromagnetic counterparts ofbinary black hole mergers as well as neutron star mergers.

J-GEM Follow-Up Observations to Search for an Optical Counterpart of The First Gravitational Wave Source GW150914