GCN Circular 21497

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