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Title
Japanese:J-GEM follow-up observations to search for an optical counterpart of the first gravitational wave source GW150914 
English:J-GEM follow-up observations to search for an optical counterpart of the first gravitational wave source GW150914 
Author
Japanese: Tomoki Morokuma, Masaomi Tanaka, Yuichiro Asakura, Fumio Abe, Paul J. Tristram, Yousuke Utsumi, Mamoru Doi, Kenta Fujisawa, 伊藤 亮介, Yoichi Itoh, Koji S. Kawabata, 河合 誠之, Daisuke Kuroda, Kazuya Matsubayashi, Kentaro Motohara, Katsuhiro L. Murata, Takahiro Nagayama, Kouji Ohta, 斉藤 嘉彦, Yoichi Tamura, Nozomu Tominaga, Makoto Uemura, Kenshi Yanagisawa, 谷津 陽一, 吉田 道利.  
English: Tomoki Morokuma, Masaomi Tanaka, Yuichiro Asakura, Fumio Abe, Paul J. Tristram, Yousuke Utsumi, Mamoru Doi, Kenta Fujisawa, Ryosuke Itoh, Yoichi Itoh, Koji S. Kawabata, Nobuyuki Kawai, Daisuke Kuroda, Kazuya Matsubayashi, Kentaro Motohara, Katsuhiro L. Murata, Takahiro Nagayama, Kouji Ohta, Yoshihiko Saito, Yoichi Tamura, Nozomu Tominaga, Makoto Uemura, Kenshi Yanagisawa, Yoichi Yatsu, Michitoshi Yoshida.  
Language English 
Journal/Book name
Japanese:Publications of the Astronomical Society of Japan 
English:Publications of the Astronomical Society of Japan 
Volume, Number, Page Volume 68    Number 4    L9
Published date June 2016 
Publisher
Japanese: 
English:OXFORD academic 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://academic.oup.com/pasj/article-lookup/doi/10.1093/pasj/psw061
 
DOI https://doi.org/10.1093/pasj/psw061
Abstract We present our optical follow-up observations to search for an electromagnetic counterpart of the first gravitational wave source GW150914 in the framework of the Japanese collaboration for Gravitational wave ElectroMagnetic follow-up (J-GEM), which is an observing group utilizing optical and radio telescopes in Japan, as well as in New Zealand, China, South Africa, Chile, and Hawaii. We carried out a wide-field imaging survey with the Kiso Wide Field Camera (KWFC) on the 1.05 m Kiso Schmidt telescope in Japan and a galaxy-targeted survey with Tripole5 on the B&C 61 cm telescope in New Zealand. Approximately 24 deg2 regions in total were surveyed in i-band with KWFC and 18 nearby galaxies were observed with Tripole5 in g-, r-, and i-bands 4-12 days after the gravitational wave detection. Median 5 σ depths are i ̃ 18.9 mag for the KWFC data and g ̃ 18.9 mag, r ̃ 18.7 mag, and i ̃ 18.3 mag for the Tripole5 data. The probability for a counterpart to be in the observed area is 1.2% in the initial skymap and 0.1% in the final skymap. We do not find any transient source associated to an external galaxy with spatial offset from its center, which is consistent with the local supernova rate.

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