TY - JOUR
T1 - J-GEM follow-up observations to search for an optical counterpart of the first gravitational wave source GW150914
AU - Morokuma, Tomoki
AU - Tanaka, Masaomi
AU - Asakura, Yuichiro
AU - Abe, Fumio
AU - Tristram, Paul J.
AU - Utsumi, Yousuke
AU - Doi, Mamoru
AU - Fujisawa, Kenta
AU - Itoh, Ryosuke
AU - Itoh, Yoichi
AU - Kawabata, Koji S.
AU - Kawai, Nobuyuki
AU - Kuroda, Daisuke
AU - Matsubayashi, Kazuya
AU - Motohara, Kentaro
AU - Murata, Katsuhiro L.
AU - Nagayama, Takahiro
AU - Ohta, Kouji
AU - Saito, Yoshihiko
AU - Tamura, Yoichi
AU - Tominaga, Nozomu
AU - Uemura, Makoto
AU - Yanagisawa, Kenshi
AU - Yatsu, Yoichi
AU - Yoshida, Michitoshi
PY - 2016
Y1 - 2016
N2 - 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 1.05m Kiso Schmidt telescope in Japan and a galaxy-targeted survey with Tripole5 on the B&C 61cm 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 18.9mag for the KWFC data and g 18.9mag, r 18.7mag, and i 18.3mag 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.
AB - 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 1.05m Kiso Schmidt telescope in Japan and a galaxy-targeted survey with Tripole5 on the B&C 61cm 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 18.9mag for the KWFC data and g 18.9mag, r 18.7mag, and i 18.3mag 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.
KW - Binaries
KW - Close-black hole physics-gravitational waves-methods
KW - Observational-surveys
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U2 - 10.1093/pasj/psw061
DO - 10.1093/pasj/psw061
M3 - Article
AN - SCOPUS:84988985227
VL - 68
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
SN - 0004-6264
IS - 4
M1 - L9
ER -