TITLE: GCN CIRCULAR NUMBER: 25133 SUBJECT: LIGO/Virgo S190720a: No counterpart candidates in KAIT observations DATE: 19/07/20 23:47:40 GMT FROM: Weikang Zheng at UC Berkeley Keto Zhang, Shaunak Modak, Yukei Murakami, Thomas de Jaeger, Benjamin Stahl, WeiKang Zheng, Emily Ma, and Alexei V. Filippenko (UC Berkeley) report on behalf of the Lick/KAIT GW follow-up team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the 90% region of the gravitational-wavei event S190720a (GCN 25115) detected by LIGO/Virgo. More than one thousand galaxies were selected from the Glade catalog V1.0 (Dalya et al., 2018, MNRAS, 479, 2374; http://aquarius.elte.hu/glade/) according to their priority score. KAIT observed 318 of them based on their priority scores and elevation visibility, with each clear-filter exposure time being 60 s. The first image was taken at 04:22:13, July 20th UT, about 4.2 hours after the trigger, and the last image at 12:09:17 UT. Our typical limiting mag is 19.0. No viable counterparts were identified and the analysis is ongoing. A full list of galaxies observed by KAIT is given below. GladeID UT(July20) RA_J2000 Dec_J2000 ----------------------------------------------- G0791468 04:22:13 12:35:48.0286 +03:12:07.0884 G0125906 04:24:39 13:41:49.1419 +26:22:24.8844 G0640817 04:25:48 13:49:23.5656 +28:06:26.6076 G1812765 04:27:02 14:17:55.68 +35:27:45.612 G0768137 04:28:55 18:13:50.6616 +47:21:14.922 G0913903 04:30:04 18:14:33.5522 +45:47:17.754 G0054767 04:31:13 18:21:52.6978 +45:07:57.6588 G0899681 04:32:22 18:23:52.0385 +45:06:13.2876 G1226063 04:33:32 18:24:36.1157 +43:45:59.4756 G1138290 04:34:41 18:26:50.5298 +45:40:50.6784 G0112846 04:35:50 18:33:17.7247 +44:46:08.7456 G0986625 04:37:00 18:34:51.2182 +44:34:54.6672 G0353251 04:38:09 18:35:37.0973 +44:03:54.5868 G1042660 04:39:18 18:36:08.5106 +44:01:02.5392 G0353888 04:40:28 18:36:48.3473 +45:33:50.3424 G0306366 04:41:37 18:40:35.6616 +44:57:17.046 G0742096 04:42:46 18:44:02.417 +45:33:29.8116 G1464441 04:43:56 18:45:37.705 +44:14:28.95 G1205454 04:45:05 18:46:04.6582 +43:47:58.7616 G1333886 04:46:14 18:48:41.2207 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