TITLE: GCN CIRCULAR NUMBER: 21497 SUBJECT: LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations DATE: 17/08/16 15:16:05 GMT FROM: Yousuke Utsumi at Hiroshima Astrophys. Science Center Yousuke Utsumi (Hiroshima Univ.), Nozomu Tominaga (Konan Univ.), Michitoshi Yoshida, Masaomi Tanaka, Tsuyoshi Terai (NAOJ), Ryou Ohsawa, Tomoki Morokuma (Univ. of Tokyo), Kouji Ohta (Kyoto Univ.), Koji S. Kawabata (Hiroshima Univ.) on behalf of J-GEM collaboration We report optical follow-up observations for G297595 with Hyper Suprime-Cam (HSC, 1.7 deg^2 FOV) attached to 8.2-m Subaru Telescope. We performed Y-band imaging observations of the high probability region using the updated skymap (LALInference.fits) on 2017-08-16 UT. We covered about 40 deg^2 with 30 pointings. Each field was visited twice with the total exposure time of 220 sec (110 sec x 2). An expected 5-sigma limiting magnitude is about 23 mag AB. The observed fields are listed below. ID UT RA DEC Exp Filter 00 2017-08-16T12:32:25 03h19m45.9s -35d40m51.6s 110.0s HSC-Y 01 2017-08-16T12:34:46 03h16m57.2s -36d25m09.4s 110.0s HSC-Y 02 2017-08-16T12:37:07 03h14m08.5s -37d09m52.4s 110.0s HSC-Y 03 2017-08-16T12:39:27 03h11m19.8s -37d55m02.3s 110.0s HSC-Y 04 2017-08-16T12:41:48 03h19m46.0s -37d09m52.3s 110.0s HSC-Y 05 2017-08-16T12:44:08 03h16m57.3s -37d55m02.4s 110.0s HSC-Y 06 2017-08-16T12:46:29 03h14m08.6s -38d40m40.4s 110.0s HSC-Y 07 2017-08-16T12:48:50 03h11m19.9s -39d26m47.6s 110.0s HSC-Y 08 2017-08-16T12:51:11 03h08m31.2s -40d13m26.1s 110.0s HSC-Y 09 2017-08-16T12:53:32 03h05m42.5s -41d00m36.7s 110.0s HSC-Y 10 2017-08-16T12:55:53 03h19m46.1s -38d40m40.2s 110.0s HSC-Y 11 2017-08-16T12:58:15 03h02m53.8s -41d48m21.6s 110.0s HSC-Y 12 2017-08-16T13:00:35 03h16m57.4s -39d26m47.5s 110.0s HSC-Y 13 2017-08-16T13:02:57 03h14m08.7s -40d13m25.9s 110.0s HSC-Y 14 2017-08-16T13:05:18 03h00m05.2s -42d36m19.7s 110.0s HSC-Y 15 2017-08-16T13:07:39 03h11m20.0s -41d00m36.6s 110.0s HSC-Y 16 2017-08-16T13:09:59 03h08m31.3s -41d48m21.6s 110.0s HSC-Y 17 2017-08-16T13:12:20 03h05m48.0s -42d36m19.7s 110.0s HSC-Y 18 2017-08-16T13:14:41 03h19m46.2s -40d13m25.8s 110.0s HSC-Y 19 2017-08-16T13:17:02 03h16m57.5s -41d00m36.6s 110.0s HSC-Y 20 2017-08-16T13:19:23 03h02m59.4s -43d24m09.2s 110.0s HSC-Y 21 2017-08-16T13:21:44 03h14m08.9s -41d48m21.4s 110.0s HSC-Y 22 2017-08-16T13:24:04 03h00m05.3s -44d11m50.0s 110.0s HSC-Y 23 2017-08-16T13:26:25 03h11m30.9s -42d36m19.7s 110.0s HSC-Y 24 2017-08-16T13:28:46 02h57m05.4s -44d59m22.5s 110.0s HSC-Y 25 2017-08-16T13:31:06 03h08m47.8s -43d24m09.1s 110.0s HSC-Y 26 2017-08-16T13:33:28 02h53m59.3s -45d46m46.8s 110.0s HSC-Y 27 2017-08-16T13:35:49 03h05m59.4s -44d11m49.9s 110.0s HSC-Y 28 2017-08-16T13:38:10 03h17m13.7s -42d36m19.7s 110.0s HSC-Y 29 2017-08-16T13:40:31 03h03m05.4s -44d59m22.5s 110.0s HSC-Y 00 2017-08-16T13:42:59 03h19m36.4s -35d41m22.6s 110.0s HSC-Y 01 2017-08-16T13:45:20 03h16m47.6s -36d25m40.4s 110.0s HSC-Y 02 2017-08-16T13:47:41 03h13m58.8s -37d10m23.5s 110.0s HSC-Y 03 2017-08-16T13:50:01 03h11m10.0s -37d55m33.4s 110.0s HSC-Y 04 2017-08-16T13:52:22 03h19m36.3s -37d10m23.4s 110.0s HSC-Y 05 2017-08-16T13:54:43 03h16m47.5s -37d55m33.4s 110.0s HSC-Y 06 2017-08-16T13:57:04 03h13m58.7s -38d41m11.4s 110.0s HSC-Y 07 2017-08-16T13:59:25 03h11m09.9s -39d27m18.7s 110.0s HSC-Y 08 2017-08-16T14:01:46 03h08m21.1s -40d13m57.0s 110.0s HSC-Y 09 2017-08-16T14:04:07 03h05m32.3s -41d01m07.7s 110.0s HSC-Y 10 2017-08-16T14:06:30 03h19m36.2s -38d41m11.3s 110.0s HSC-Y 11 2017-08-16T14:08:51 03h02m43.5s -41d48m52.6s 110.0s HSC-Y 12 2017-08-16T14:11:12 03h16m47.4s -39d27m18.6s 110.0s HSC-Y 13 2017-08-16T14:13:34 03h13m58.6s -40d13m57.0s 110.0s HSC-Y 14 2017-08-16T14:15:55 02h59m54.6s -42d36m50.8s 110.0s HSC-Y 15 2017-08-16T14:18:17 03h11m09.8s -41d01m07.7s 110.0s HSC-Y 16 2017-08-16T14:20:38 03h08m21.0s -41d48m52.6s 110.0s HSC-Y 17 2017-08-16T14:22:59 03h05m37.5s -42d36m50.8s 110.0s HSC-Y 18 2017-08-16T14:25:20 03h19m36.1s -40d13m56.9s 110.0s HSC-Y 19 2017-08-16T14:27:41 03h16m47.3s -41d01m07.7s 110.0s HSC-Y 20 2017-08-16T14:30:02 03h02m48.8s -43d24m40.2s 110.0s HSC-Y 21 2017-08-16T14:32:23 03h13m58.5s -41d48m52.6s 110.0s HSC-Y 22 2017-08-16T14:34:44 02h59m54.5s -44d12m21.0s 110.0s HSC-Y 23 2017-08-16T14:37:05 03h11m20.4s -42d36m50.7s 110.0s HSC-Y 24 2017-08-16T14:39:26 02h56m54.4s -44d59m53.5s 110.0s HSC-Y 25 2017-08-16T14:41:48 03h08m37.2s -43d24m40.2s 110.0s HSC-Y 26 2017-08-16T14:44:08 02h53m48.3s -45d47m17.8s 110.0s HSC-Y 27 2017-08-16T14:46:29 03h05m48.6s -44d12m20.9s 110.0s HSC-Y 28 2017-08-16T14:48:50 03h17m03.2s -42d36m50.7s 110.0s HSC-Y 29 2017-08-16T14:51:11 03h02m54.4s -44d59m53.5s 110.0s HSC-Y