TITLE: GCN CIRCULAR NUMBER: 25663 SUBJECT: LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations DATE: 19/09/05 00:01:34 GMT FROM: Weikang Zheng at UC Berkeley Sergiy Vasylyev, Nachiket Girish, Thomas de Jaeger, Yukei Murakami, Benjamin E. Stahl, Keto D. Zhang, James Sunseri, Shaunak Modak, WeiKang Zheng, Andrew Hoffman, 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-wave event S190901ap (GCN 25606; GCN 25614) 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 156 of them on Sep. 02 UT starting at 3.8 hours after the trigger, and additional 143 on Sep. 03 UT starting at 1.37 days after the trigger, according to their priority scores and elevation visibility, with each clear-filter exposure time being 60 s. 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. In addition, we took 7x180s clear band images of ZTF19abvizsw/AT2019pim (Kool et al., GCN 25616), now considered as an unrelated GRB optical afterglows candidate (Burdge et al., GCN 25639; Wei et al., GCN 25640; Perley et al., GCN 25643; Salmaso et al., GCN 25650; Levan et al., GCN 25653; Becerra et al., GCN 25655; Ho et al., GCN 25658). We estimate the clear band magnitude to be ~21.3 +/- 0.2 mag in our co-added image at Sep. 04.23 UT, calibrated to PS1 catalog. GladeID UT(Sep02) RA_J2000 Dec_J2000 ----------------------------------------------- G0194613 03:19:18 14:31:05.4346 +00:36:46.4688 G1875693 03:22:46 14:31:39.36 -00:17:11.94 G0603373 03:23:55 14:31:44.381 +00:48:42.7932 G1878039 03:25:04 14:32:14.88 +00:47:01.356 G1733195 03:26:14 14:32:41.52 +00:47:29.832 G0658315 03:27:23 14:32:48.7318 +02:04:41.9088 G0905344 03:28:32 14:32:53.1482 +01:32:24.414 G0740361 03:29:42 14:33:15.055 -00:49:28.992 G0663999 03:30:53 14:33:20.1562 +00:39:52.5492 G0307996 03:32:02 14:33:29.1614 +00:46:53.3316 G0757580 03:33:12 14:33:35.365 +00:54:26.3196 G0608391 03:34:23 14:33:36.7675 -01:05:05.6112 G0748622 03:35:32 14:33:44.8279 +00:47:42.3024 G0664011 03:36:42 14:33:57.2167 +00:35:10.8528 G0745915 03:37:53 14:34:09.0014 +01:37:00.8616 G1742502 03:39:07 14:34:13.92 +03:01:40.116 G0737461 03:40:16 14:34:23.7269 +02:23:31.038 G0783945 03:41:25 14:34:27.0667 +01:04:49.0404 G1278665 03:42:34 14:34:38.0712 +01:38:46.0392 G0756340 03:43:44 14:34:42.1363 +00:54:50.0364 G1742550 03:44:53 14:34:47.76 +02:02:28.536 G0713702 03:46:48 15:20:51.7932 -00:43:47.9316 G1224425 03:47:57 15:21:02.4096 -03:33:40.914 G0020414 03:49:07 15:21:08.7708 -07:20:45.6684 G1403147 03:50:16 15:21:15.9667 -10:11:20.67 G0838596 03:51:29 15:21:18.5669 -04:18:36.8172 G0917972 03:52:41 15:21:23.269 -12:04:38.2476 G0331855 03:53:50 15:21:33.2374 -08:49:50.6424 G1450425 03:54:59 15:21:34.6142 -08:04:07.6404 G1290735 03:56:09 15:21:48.6254 -06:14:40.0632 G0303133 03:57:18 15:22:05.8226 -05:28:59.1924 G0971203 03:58:29 15:23:07.3058 +01:25:40.9296 G1147715 03:59:43 15:23:59.0551 -10:49:57.8712 G0042791 04:00:54 15:24:16.7506 -05:46:36.102 G1109765 04:02:04 15:24:44.8205 -04:40:08.346 G1362904 04:03:13 15:25:47.7394 -06:52:10.0992 G0070527 04:04:22 15:25:51.7714 -01:53:01.3236 G1191119 04:05:33 15:26:42.9382 +00:13:14.7504 G1452726 04:06:44 15:27:11.8543 -08:35:42.1188 G0940632 04:07:53 15:27:14.6155 -04:44:00.51 G0936205 04:09:03 15:27:19.314 -05:19:06.5028 G1059447 04:10:14 15:28:06.6029 -11:12:38.5776 G0883642 04:11:25 15:29:02.5378 -05:34:13.152 G0928928 04:12:34 15:29:20.3357 -05:25:03.3528 G0906688 04:13:46 15:30:27.7735 -10:56:40.6788 G1388643 04:14:55 15:34:27.9749 -09:15:48.906 G0214088 04:16:06 15:34:42.9053 -04:14:22.6068 G1461463 04:17:18 15:35:15.2527 -09:24:21.5568 G1172917 04:18:27 15:36:50.2661 -06:06:55.4328 G0989502 04:19:36 15:37:52.2437 -07:12:55.4724 G0536188 04:20:48 15:24:40.177 -12:42:49.8276 G0566794 04:27:19 16:02:19.8449 +16:20:46.2552 G0395107 04:28:28 16:04:26.7298 +17:45:01.188 G0479641 04:29:38 16:05:44.5862 +16:12:11.8944 G0593543 04:30:47 16:06:22.8334 +19:46:40.2636 G0668634 04:31:56 16:06:42.0703 +16:19:11.154 G0657647 04:33:35 16:11:11.0083 +61:16:04.5444 G0627263 04:35:18 16:12:53.357 -21:37:24.0528 G0554714 04:36:44 16:13:04.9805 +30:54:05.994 G0684706 04:38:11 16:14:57.0154 +55:52:25.0428 G0789194 04:39:34 16:28:38.2764 +39:33:04.968 G0666910 04:40:54 16:32:57.2095 +50:24:05.1156 G0708649 04:42:20 16:34:25.4846 +21:32:27.0096 G0818453 04:43:46 16:43:23.1554 -24:52:47.0784 G0636473 04:45:10 16:45:26.4149 +18:12:30.3948 G0004443 04:46:33 16:49:03.6732 -17:38:45.3732 G0667530 04:47:42 16:49:21.0204 -17:38:40.326 G0628454 04:48:52 16:50:53.4228 -15:00:14.346 G0559558 04:50:01 16:52:07.7491 -17:03:13.518 G0609502 04:51:12 16:53:04.8559 -16:17:27.3552 G0788598 04:52:40 16:53:52.207 +39:45:36.9288 G0748918 04:54:05 16:54:08.7598 -07:38:07.314 G0613278 04:55:16 16:54:53.6462 -16:57:07.2756 G0771147 04:56:40 16:57:58.0994 +27:51:15.7248 G0644414 04:57:58 17:06:49.8048 +42:25:24.492 G0602659 04:59:23 17:10:50.4713 -06:30:43.0848 G0656855 05:00:33 17:11:14.9486 -05:21:58.3812 G0624001 05:01:42 17:12:33.2081 -05:35:26.7432 G0633958 05:02:55 17:18:54.0893 +08:26:26.9448 G1041639 05:04:19 17:20:15.6739 +39:15:37.8468 G0393771 05:05:44 17:21:28.9747 -07:09:55.9764 G0601575 05:06:55 17:21:45.4687 -00:47:43.2564 G0611033 05:08:10 17:23:05.3832 +12:41:43.512 G0686176 05:09:26 17:24:37.8295 -02:43:06.222 G0678938 05:10:35 17:27:40.6349 -06:41:02.238 G0585341 05:11:45 17:35:42.6854 -07:41:34.7424 G0707284 05:13:08 17:40:05.1636 +33:48:41.1012 G0710164 05:15:07 17:42:31.9702 +00:13:00.336 G1308107 05:16:19 17:42:50.2001 -09:43:26.5872 G0669959 05:17:43 17:45:14.4214 +38:54:57.7944 G1059666 05:19:01 17:48:43.2055 +24:39:07.3404 G0627653 05:20:19 17:50:35.0904 -01:39:06.3288 G0771881 05:21:43 17:52:41.8286 +29:50:19.3596 G0563085 05:23:01 17:55:27.9053 -00:01:52.5144 G0636803 05:24:20 17:56:20.2442 +26:21:59.58 G0638214 05:25:38 18:02:09.4776 +12:52:02.1504 G0754747 05:26:50 18:11:54.9024 +07:43:50.61 G1347890 05:27:59 18:12:50.4859 +07:30:08.928 G0794966 05:29:12 18:14:28.5058 +00:46:55.1928 G1856081 05:30:26 18:16:40.56 +15:17:56.04 G0233642 05:31:42 18:26:07.163 +03:01:37.5384 G0826631 05:32:55 18:28:01.4722 +16:07:32.7612 G0154905 05:34:20 18:52:14.1797 -23:16:18.21 G0691261 05:35:50 18:57:37.5 +38:00:32.202 G1849647 05:37:31 22:49:54.72 +11:36:29.592 G0010892 06:31:39 23:14:54.2578 -20:59:45.3408 G0706844 06:32:51 23:17:27.2242 -10:01:50.466 G0703575 06:35:09 23:18:52.5439 -10:15:33.5268 G0551567 06:36:21 23:21:14.1725 -21:14:09.8736 G0553140 06:37:30 23:22:00.9228 -23:30:24.6924 G0582772 06:38:41 23:22:35.2735 -13:05:38.8392 G0001180 06:39:51 23:24:06.9506 -11:51:38.6856 G0800782 06:41:00 23:29:56.6969 -12:29:05.7048 G0606247 06:42:09 23:30:23.7377 -12:04:45.5448 G0820960 06:43:23 23:32:31.3476 -24:00:18.5652 G0556216 06:44:32 23:37:06.9288 -20:27:47.0988 G0612966 06:45:41 23:40:45.9667 -20:30:31.5108 G0666486 06:46:55 23:41:52.6685 -08:38:53.7144 G0579080 06:48:08 23:45:31.3037 -20:58:49.8036 G0751781 06:51:36 23:48:54.7118 -16:32:28.2588 G1852091 06:52:43 23:48:56.88 -16:32:24.684 G0748482 06:53:53 23:54:20.9254 -17:18:21.0348 G0733653 06:55:02 23:56:47.7247 -16:30:34.5924 G0755443 06:56:12 23:58:40.525 -17:33:31.7124 G0755095 07:30:01 00:07:10.2658 -21:47:11.5008 G0559232 07:31:14 00:11:12.5945 -33:34:42.8016 G0555127 07:32:26 00:13:02.9052 -24:12:52.5024 G0587522 07:33:35 00:19:04.9488 -22:56:11.184 G0665013 07:34:47 00:19:09.3768 -24:31:23.2068 G0552516 07:35:57 00:22:38.9513 -24:07:36.9624 G0823492 07:37:08 00:31:49.3798 -26:43:13.926 G0740509 07:38:17 00:36:27.3996 -27:47:07.4472 G0708432 07:39:31 00:53:54.0602 -31:05:43.8432 G1641290 07:40:42 01:04:30.36 -33:39:15.768 G0762311 07:41:54 01:06:12.2227 -30:10:41.1744 G1641121 07:43:07 01:19:41.448 -33:06:29.556 G0783834 07:44:21 01:19:47.6698 -33:04:59.9808 G0595298 07:45:32 01:23:14.8567 -32:50:28.6008 G0629787 07:55:55 00:08:34.535 -33:51:29.9196 G0725300 07:57:04 00:09:35.5241 -32:16:36.5412 G0681282 07:58:16 00:14:33.5014 -24:42:09.7452 G0820749 07:59:25 00:20:42.0396 -23:16:58.2348 G0594514 08:00:36 00:44:15.959 -28:37:56.2728 G0589660 08:01:46 00:49:42.0413 -30:17:43.1736 G0601466 08:02:55 00:50:19.1225 -30:29:07.7928 G0697151 08:04:08 01:07:21.6086 -33:22:33.3912 G0671624 08:05:20 01:07:35.9945 -33:38:16.404 G0785220 08:06:31 01:12:09.409 -32:14:32.6148 G0783779 08:07:43 01:13:07.4479 -34:00:55.4544 G0657724 08:08:56 01:22:32.7113 -29:58:57.054 G0562220 08:11:21 01:38:28.5005 -33:36:28.9836 G0238284 08:12:35 01:38:59.6544 -28:34:20.478 G0791379 08:13:48 01:50:14.1576 -28:52:18.912 G0557460 08:15:00 01:50:41.5296 -32:36:15.102 G0749262 08:56:11 03:39:42.2206 -14:34:07.4136 G0771722 08:57:23 03:42:03.3526 -17:31:15.7764 GladeID UT(Sep03) RA_J2000 Dec_J2000 ----------------------------------------------- G0010892 08:25:01 23:14:54.2578 -20:59:45.3408 G0706844 08:26:12 23:17:27.2242 -10:01:50.466 G0713107 08:27:23 23:18:46.3769 -10:23:57.5232 G0703575 08:28:32 23:18:52.5439 -10:15:33.5268 G0551567 08:29:43 23:21:14.1725 -21:14:09.8736 G0553140 08:30:53 23:22:00.9228 -23:30:24.6924 G0582772 08:32:04 23:22:35.2735 -13:05:38.8392 G0001180 08:33:13 23:24:06.9506 -11:51:38.6856 G0800782 08:34:22 23:29:56.6969 -12:29:05.7048 G0606247 08:35:32 23:30:23.7377 -12:04:45.5448 G0820960 08:36:45 23:32:31.3476 -24:00:18.5652 G0556216 08:37:55 23:37:06.9288 -20:27:47.0988 G0612966 08:39:04 23:40:45.9667 -20:30:31.5108 G0666486 08:40:18 23:41:52.6685 -08:38:53.7144 G0579080 08:41:32 23:45:31.3037 -20:58:49.8036 G0584703 08:42:41 23:46:03.6036 -17:18:24.4296 G0682292 08:43:50 23:47:16.6992 -15:18:23.0148 G0751781 08:45:00 23:48:54.7118 -16:32:28.2588 G1852091 08:46:09 23:48:56.88 -16:32:24.684 G0748482 08:47:18 23:54:20.9254 -17:18:21.0348 G0733653 08:48:28 23:56:47.7247 -16:30:34.5924 G0755443 08:49:37 23:58:40.525 -17:33:31.7124 G0755095 09:30:03 00:07:10.2658 -21:47:11.5008 G0559232 09:31:16 00:11:12.5945 -33:34:42.8016 G0555127 09:32:27 00:13:02.9052 -24:12:52.5024 G0587522 09:33:37 00:19:04.9488 -22:56:11.184 G0665013 09:34:48 00:19:09.3768 -24:31:23.2068 G0552516 09:35:57 00:22:38.9513 -24:07:36.9624 G0823492 09:37:09 00:31:49.3798 -26:43:13.926 G0740509 09:38:18 00:36:27.3996 -27:47:07.4472 G0708432 09:39:27 00:53:54.0602 -31:05:43.8432 G1641290 09:40:41 01:04:30.36 -33:39:15.768 G0762311 09:41:50 01:06:12.2227 -30:10:41.1744 G1641121 09:43:01 01:19:41.448 -33:06:29.556 G0783834 09:44:11 01:19:47.6698 -33:04:59.9808 G0595298 09:45:23 01:23:14.8567 -32:50:28.6008 G0607401 09:46:32 01:24:34.5158 -33:10:24.6432 G0779486 09:47:42 01:24:50.3083 -31:45:23.8392 G0033739 09:48:57 01:47:44.4682 -33:36:05.5152 G0650576 09:50:11 02:15:38.0998 -33:00:31.5036 G0581927 09:51:23 02:17:13.6258 -33:00:41.5152 G1155066 09:52:36 02:35:13.4573 -29:36:16.6932 G0645820 09:53:46 02:38:45.1502 -30:48:23.3496 G0744351 09:54:55 02:44:15.8779 -31:56:31.3692 G0744589 09:56:06 02:46:41.6803 -25:20:47.8284 G0599710 09:57:18 02:56:13.0517 -28:02:31.5276 G0673848 09:58:27 02:56:42.421 -27:36:44.3808 G0607507 09:59:40 03:12:05.2524 -27:06:14.5728 G0605059 10:00:50 03:12:11.1941 -23:37:44.9004 G0803398 10:01:59 03:12:18.3096 -24:37:13.5336 G0767303 10:03:08 03:14:40.4534 -28:55:56.406 G0675048 10:04:20 03:16:22.8038 -23:48:36.7596 G0650576 10:34:49 02:15:38.0998 -33:00:31.5036 G0581927 10:35:56 02:17:13.6258 -33:00:41.5152 G0810505 10:37:10 02:25:46.3166 -26:06:50.7168 G1645381 10:38:19 02:28:16.464 -26:07:58.116 G0621255 10:39:28 02:35:21.6732 -25:31:39.7164 G0729094 10:40:37 02:37:35.3695 -26:22:04.1196 G0645820 10:41:47 02:38:45.1502 -30:48:23.3496 G0744351 10:42:56 02:44:15.8779 -31:56:31.3692 G0744589 10:44:05 02:46:41.6803 -25:20:47.8284 G0599710 10:45:17 02:56:13.0517 -28:02:31.5276 G0673848 10:46:26 02:56:42.421 -27:36:44.3808 G0625893 10:47:40 03:00:18.1229 -23:18:22.3344 G0805372 10:48:49 03:03:07.1767 -22:12:19.8108 G0691149 10:49:58 03:05:38.9611 -24:41:51.7488 G0607507 10:51:08 03:12:05.2524 -27:06:14.5728 G0605059 10:52:18 03:12:11.1941 -23:37:44.9004 G0803398 10:53:27 03:12:18.3096 -24:37:13.5336 G0642006 10:54:36 03:13:23.5886 -24:52:15.6216 G0675048 10:55:48 03:16:22.8038 -23:48:36.7596 G0699701 10:56:59 03:18:03.3581 -29:37:59.34 G0821941 10:58:08 03:20:51.7558 -30:47:19.1436 G0708674 10:59:18 03:23:17.8536 -27:39:21.1392 G0552792 11:00:29 03:25:27.6353 -22:29:25.9224 G0738507 11:01:38 03:25:44.6146 -26:23:17.1924 G0271141 11:02:52 03:27:20.8512 -13:44:54.3336 G0823848 11:04:03 03:28:43.7998 -19:57:07.7976 G0031069 11:05:14 03:29:55.7556 -28:46:03.9468 G0781950 11:06:26 03:30:46.6442 -20:31:26.634 G0707270 11:07:37 03:31:20.778 -26:06:09.2628 G0818993 11:08:46 03:31:24.3055 -20:10:06.4812 G0766666 11:25:41 02:26:36.2136 -23:25:01.3908 G1155066 11:26:52 02:35:13.4573 -29:36:16.6932 G0684350 11:28:02 02:37:33.9698 -27:26:30.12 G0634799 11:29:13 02:54:12.551 -33:43:07.7484 G0677246 11:30:24 03:03:53.8303 -24:33:54.4824 G0715403 11:31:33 03:08:11.7554 -22:55:22.3824 G0656204 11:32:43 03:11:09.8849 -25:19:14.4696 G0609459 11:33:52 03:11:34.5859 -26:53:47.4072 G0594595 11:35:01 03:12:26.5841 -27:08:24.594 G0675679 11:36:11 03:13:28.9006 -25:23:01.6548 G0723713 11:37:22 03:14:32.9746 -34:07:39.8316 G0767303 11:38:32 03:14:40.4534 -28:55:56.406 G0626814 11:39:41 03:16:08.7864 -29:18:20.412 G0625541 11:40:51 03:17:41.9623 -29:36:34.326 G0622813 11:42:05 03:18:03.7783 -19:29:15.0396 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