TITLE: GCN CIRCULAR NUMBER: 24450 SUBJECT: LIGO/Virgo S190510g: HSC Y-band follow-up observation DATE: 19/05/10 10:56:39 GMT FROM: Michitoshi Yoshida at NAOJ/Subaru Michitoshi Yoshida, Yuhei Takagi, Tsuyoshi Terai (NAOJ) Yousuke Utsumi (Stanford Univ.), Nozomu Tominaga (Konan Univ.), Mahito Sasada, Hiroshi Akitaya (Hiroshima Univ.) on behalf of J-GEM collaboration We report optical imaging follow-up observations for a part of the equator region (RA:13h, Dec:0d) of S190510g (LIGO Scientific Collaboration and the Virgo Collaboration, GCN #24442) with Hyper Suprime-Cam (HSC) attached to the 8.2-m Subaru Telescope. HSC has a circular field-of-view whose area is 1.7 deg^2. We performed Y-band imaging observations on 2019-05-10 UT. The exposure time per frame was 30 sec. We covered 140 deg^2 around the high probability area in the equator region of the Bayestar skymap of S190510g with 120 pointings of HSC. We revisited each pointing position two times. The 5-sigma limiting AB magnitude of Y-band was about 22.7 mag. The observed regions are as follows: JGEM28175 13:27:11.25 -08:23:07.9 JGEM28432 13:30:00.00 -08:59:21.5 JGEM27663 13:27:11.25 -07:10:50.7 JGEM27920 13:30:00.00 -07:46:57.8 JGEM28176 13:32:48.75 -08:23:07.9 JGEM28433 13:35:37.50 -08:59:21.5 JGEM26895 13:24:22.50 -05:22:45.8 JGEM27151 13:27:11.25 -05:58:45.0 JGEM27408 13:30:00.00 -06:34:46.5 JGEM27664 13:32:48.75 -07:10:50.7 JGEM27921 13:35:37.50 -07:46:57.8 JGEM28177 13:38:26.25 -08:23:07.9 JGEM26383 13:24:22.50 -04:10:53.5 JGEM26639 13:27:11.25 -04:46:48.7 JGEM26896 13:30:00.00 -05:22:45.8 JGEM27152 13:32:48.75 -05:58:45.0 JGEM27409 13:35:37.50 -06:34:46.5 JGEM27665 13:38:26.25 -07:10:50.7 JGEM27922 13:41:15.00 -07:46:57.8 JGEM25871 13:24:22.50 -02:59:07.8 JGEM26127 13:27:11.25 -03:34:60.0 JGEM26384 13:30:00.00 -04:10:53.5 JGEM26640 13:32:48.75 -04:46:48.7 JGEM26897 13:35:37.50 -05:22:45.8 JGEM27153 13:38:26.25 -05:58:45.0 JGEM27410 13:41:15.00 -06:34:46.5 JGEM27666 13:44:03.75 -07:10:50.7 JGEM25615 13:27:11.25 -02:23:16.9 JGEM25872 13:30:00.00 -02:59:07.8 JGEM26128 13:32:48.75 -03:34:60.0 JGEM26385 13:35:37.50 -04:10:53.5 JGEM26641 13:38:26.25 -04:46:48.7 JGEM26898 13:41:15.00 -05:22:45.8 JGEM27154 13:44:03.75 -05:58:45.0 JGEM25103 13:27:11.25 -01:11:37.5 JGEM25360 13:30:00.00 -01:47:26.8 JGEM25616 13:32:48.75 -02:23:16.9 JGEM25873 13:35:37.50 -02:59:07.8 JGEM26129 13:38:26.25 -03:34:60.0 JGEM26386 13:41:15.00 -04:10:53.5 JGEM26642 13:44:03.75 -04:46:48.7 JGEM24591 13:27:11.25 -00:00:00.0 JGEM26899 13:46:52.50 -05:22:45.8 JGEM24848 13:30:00.00 -00:35:48.6 JGEM25104 13:32:48.75 -01:11:37.5 JGEM25361 13:35:37.50 -01:47:26.8 JGEM25617 13:38:26.25 -02:23:16.9 JGEM25874 13:41:15.00 -02:59:07.8 JGEM26130 13:44:03.75 -03:34:60.0 JGEM26387 13:46:52.50 -04:10:53.5 JGEM24336 13:30:00.00 -00:35:48.6 JGEM24592 13:32:48.75 -00:00:00.0 JGEM24849 13:35:37.50 -00:35:48.6 JGEM25105 13:38:26.25 -01:11:37.5 JGEM25362 13:41:15.00 -01:47:26.8 JGEM23824 13:30:00.00 +01:47:26.8 JGEM25618 13:44:03.75 -02:23:16.9 JGEM25875 13:46:52.50 -02:59:07.8 JGEM24080 13:32:48.75 +01:11:37.5 JGEM24337 13:35:37.50 -00:35:48.6 JGEM24593 13:38:26.25 -00:00:00.0 JGEM23312 13:30:00.00 +02:59:07.8 JGEM24850 13:41:15.00 -00:35:48.6 JGEM25106 13:44:03.75 -01:11:37.5 JGEM23568 13:32:48.75 +02:23:16.9 JGEM25363 13:46:52.50 -01:47:26.8 JGEM25619 13:49:41.25 -02:23:16.9 JGEM23825 13:35:37.50 +01:47:26.8 JGEM24081 13:38:26.25 +01:11:37.5 JGEM24338 13:41:15.00 -00:35:48.6 JGEM23056 13:32:48.75 +03:34:60.0 JGEM24594 13:44:03.75 -00:00:00.0 JGEM24851 13:46:52.50 -00:35:48.6 JGEM23313 13:35:37.50 +02:59:07.8 JGEM25107 13:49:41.25 -01:11:37.5 JGEM23569 13:38:26.25 +02:23:16.9 JGEM22544 13:32:48.75 +04:46:48.7 JGEM23826 13:41:15.00 +01:47:26.8 JGEM24082 13:44:03.75 +01:11:37.5 JGEM22801 13:35:37.50 +04:10:53.5 JGEM24339 13:46:52.50 -00:35:48.6 JGEM24595 13:49:41.25 -00:00:00.0 JGEM23057 13:38:26.25 +03:34:60.0 JGEM22032 13:32:48.75 +05:58:45.0 JGEM23314 13:41:15.00 +02:59:07.8 JGEM22289 13:35:37.50 +05:22:45.8 JGEM23570 13:44:03.75 +02:23:16.9 JGEM23827 13:46:52.50 +01:47:26.8 JGEM22545 13:38:26.25 +04:46:48.7 JGEM22802 13:41:15.00 +04:10:53.5 JGEM21777 13:35:37.50 +06:34:46.5 JGEM23058 13:44:03.75 +03:34:60.0 JGEM22033 13:38:26.25 +05:58:45.0 JGEM23315 13:46:52.50 +02:59:07.8 JGEM22290 13:41:15.00 +05:22:45.8 JGEM22546 13:44:03.75 +04:46:48.7 JGEM23835 14:31:52.50 +01:47:26.8 JGEM23578 14:29:03.75 +02:23:16.9 JGEM23322 14:26:15.00 +02:59:07.8 JGEM23323 14:31:52.50 +02:59:07.8 JGEM23066 14:29:03.75 +03:34:60.0 JGEM22810 14:26:15.00 +04:10:53.5 JGEM23067 14:34:41.25 +03:34:60.0 JGEM22811 14:31:52.50 +04:10:53.5 JGEM22298 14:26:15.00 +05:22:45.8 JGEM22554 14:29:03.75 +04:46:48.7 JGEM22555 14:34:41.25 +04:46:48.7 JGEM22042 14:29:03.75 +05:58:45.0 JGEM22299 14:31:52.50 +05:22:45.8 JGEM22813 14:43:07.50 +04:10:53.5 JGEM22557 14:45:56.25 +04:46:48.7 JGEM22301 14:43:07.50 +05:22:45.8 JGEM22044 14:40:18.75 +05:58:45.0 JGEM22302 14:48:45.00 +05:22:45.8 JGEM22045 14:45:56.25 +05:58:45.0 JGEM21789 14:43:07.50 +06:34:46.5 JGEM22303 14:54:22.50 +05:22:45.8 JGEM22046 14:51:33.75 +05:58:45.0 JGEM21790 14:48:45.00 +06:34:46.5 JGEM21791 14:54:22.50 +06:34:46.5