TITLE: GCN CIRCULAR NUMBER: 20779 SUBJECT: LIGO/Virgo G275404: Nearby galaxy observations by J-GEM collaboration DATE: 17/03/01 05:57:38 GMT FROM: Michitoshi Yoshida at J-GEM Yoshida, M., Utsumi, Y. (Hiroshima U.), Itoh, R., Tachibana, Y., Fujiwara, T., Morita, K., Saito, Y., Kawai, N. (Tokyo Tech), Yanagisawa, K., Kuroda, D. (OAO, NAOJ) on behalf of J-GEM collaboration We conducted optical imaging observations of nearby galaxies within the probability skymap of G275404 (LVC; GCN 20738) with the 50cm MITSuME telescopes at Akeno Observatory and Okayama Astrophysical Observatoty (OAO) and the 91cm wide field near-infrared camera (OAOWFC) at OAO in the framework of J-GEM collaboration. We obtained optical three color data, g', Rc, and Ic, with MITSuME. Near-infrared J-band data were obtained with OAOWFC. The 5-sigma limiting AB magnitudes are listed below. No optical/infrared transient source corresponding to the GW event was found by these observations. Telescope: Akeno-MITSuME --------------------------------------------------------------- galaxy RA DEC UT g' Rc Ic --------------------------------------------------------------- GL070934+815806 107.392 81.9682 2017/2/26-10:57 17.2 16.3 16.2 GL082903+631748 127.2626 63.2968 2017/2/26-13:01 18.5 17.8 17.1 GL080157+755626 120.4879 75.9405 2017/2/26-12:32 17.5 16.7 16.4 GL205542+694433 313.9234 69.7426 2017/2/26-09:55 16.3 15.1 14.7 --------------------------------------------------------------- Telescope: OAO-MITSuME --------------------------------------------------------------- galaxy RA DEC UT g' Rc Ic --------------------------------------------------------------- GL080414+625854 121.0578 62.9817 2017/2/26-12:29 19.2 19.0 18.7 GL073200+834257 113 83.7157 2017/2/26-16:24 18.7 18.8 18.2 GL073048+734223 112.702 73.7063 2017/2/26-16:04 19.1 18.7 17.7 GL080012+681439 120.0508 68.2442 2017/2/26-15:04 19.1 18.9 18.6 GL080925+675304 122.3541 67.8845 2017/2/26-14:44 19.1 18.9 18.5 GL081102+674602 122.7601 67.7671 2017/2/26-14:24 19.2 19.1 18.7 GL101338-005532 153.4096 -0.9255 2017/2/26-14:01 18.3 18.4 17.8 GL080408+625902 121.0333 62.9839 2017/2/26-12:29 19.2 19.0 18.7 GL072924+720740 112.3508 72.1279 2017/2/26-12:08 18.5 18.4 18.1 GL072301+770105 110.7546 77.018 2017/2/27-16:34 19.6 19.1 18.2 GL081343+642011 123.4296 64.3365 2017/2/27-16:14 19.6 19.3 18.8 GL082406+672912 126.023 67.4866 2017/2/27-15:55 19.4 19.3 18.7 GL042619+861143 66.5777 86.1953 2017/2/27-15:11 19.3 19.1 18.5 GL053258+834643 83.2431 83.7786 2017/2/27-14:51 19.2 19.2 18.7 GL054237+832440 85.6532 83.411 2017/2/27-14:31 19.2 19.3 18.7 GL064623+750738 101.5974 75.1273 2017/2/27-14:12 19.4 19.2 18.7 --------------------------------------------------------------- Telescooe: OAOWFC ------------------------------------------------------ galaxy RA DEC UT J ------------------------------------------------------ GL072256+782247 110.7315 78.3796 2017/2/27-15:46 18.8 GL081343+642011 123.4296 64.3365 2017/2/27-15:20 18.0 GL072301+770105 110.7546 77.018 2017/2/27-14:54 18.8 GL080925+675304 122.3541 67.8845 2017/2/27-14:08 18.8 GL081102+674602 122.7601 67.7671 2017/2/27-14:08 18.8 GL080414+625854 121.0578 62.9817 2017/2/27-13:23 18.9 GL064623+750738 101.5974 75.1273 2017/2/27-12:37 18.8 GL080925+675304 122.3541 67.8845 2017/2/27-11:51 18.7 GL081102+674602 122.7601 67.7671 2017/2/27-11:51 18.7 ------------------------------------------------------