{
  "bibcode": "2019GCN.26488....1Z",
  "body": "Z.P. Zhu, B.Y. Yu, D. Xu (NAOC), X. Zhang, S.G. Ma, J.Z. Liu, H.B. Niu \n(XAO), H.J. Wang, L. Ge, T.M. Zhang, X. Zhou, C.Z. Cui, Y.F. Xu (NAOC), \nH.B. Zhao, B. Li (PMO), J.R. Mao\n(YNAO), X. Gao (Urumqi No.1 Senior High School) report on behalf of the \nGWFUNC collaboration:\n\nWe observed the high-probability localization region of the LIGO/Virgo \ngravitational wave trigger S191216ap (GCN #26454) that can be reached by \nthe Nanshan One-meter Wide field Telescope (NOWT) with the FOV of \n1.3x1.3 deg^2. Observations started at 11:57:05 UT and ended at 15:19:31 \nUT on 2019-12-17 in R-band. Typical limiting depth is of ~19.0 mag, and \n60 sec for each exposure.\n\nListed below are the center coordinates of each exposure:\n\n21:12:36.864000 +29:36:00.000000\n21:18:35.424000 +29:36:00.000000\n21:06:33.984000 +30:54:00.000000\n21:18:40.608000 +30:54:00.000000\n21:06:28.800000 +32:12:00.000000\n21:12:36.864000 +32:12:00.000000\n21:18:45.792000 +32:12:00.000000\n21:12:19.584000 +25:42:00.000000\n21:18:05.184000 +25:42:00.000000\n21:23:51.648000 +25:42:00.000000\n21:12:15.264000 +27:00:00.000000\n21:18:05.184000 +27:00:00.000000\n21:18:05.184000 +28:18:00.000000\n21:23:59.424000 +28:18:00.000000\n20:52:44.544000 +37:24:00.000000\n21:05:50.784000 +37:24:00.000000\n20:52:37.632000 +38:42:00.000000\n21:05:57.696000 +38:42:00.000000\n20:52:30.720000 +40:00:00.000000\n20:59:17.664000 +40:00:00.000000\n21:06:04.608000 +40:00:00.000000\n21:06:22.752000 +21:48:00.000000\n21:17:34.944000 +21:48:00.000000\n21:06:18.432000 +23:06:00.000000\n21:11:58.848000 +23:06:00.000000\n21:06:15.840000 +24:24:00.000000\n21:11:58.848000 +24:24:00.000000\n21:17:40.992000 +24:24:00.000000\n20:43:26.400000 +41:18:00.000000\n20:50:21.984000 +41:18:00.000000\n20:57:17.568000 +41:18:00.000000\n20:43:17.760000 +42:36:00.000000\n20:50:21.984000 +42:36:00.000000\n20:57:25.344000 +42:36:00.000000\n20:43:08.256000 +43:54:00.000000\n20:50:21.984000 +43:54:00.000000\n20:57:34.848000 +43:54:00.000000\n20:47:35.232000 +33:30:00.000000\n20:53:50.208000 +33:30:00.000000\n21:00:04.320000 +33:30:00.000000\n21:00:10.368000 +34:48:00.000000\n20:47:24.864000 +36:06:00.000000\n20:53:50.208000 +36:06:00.000000\n21:00:16.416000 +36:06:00.000000\n21:12:18.720000 +14:00:00.000000\n21:17:40.992000 +14:00:00.000000\n21:23:01.536000 +14:00:00.000000\n21:12:16.992000 +15:18:00.000000\n21:17:40.992000 +15:18:00.000000\n21:23:03.264000 +15:18:00.000000\n21:12:14.400000 +16:36:00.000000\n21:23:05.856000 +16:36:00.000000\n21:12:50.688000 +33:30:00.000000\n21:19:04.800000 +33:30:00.000000\n21:06:30.528000 +34:48:00.000000\n21:12:50.688000 +34:48:00.000000\n21:19:09.984000 +34:48:00.000000\n21:06:23.616000 +36:06:00.000000\n21:12:50.688000 +36:06:00.000000\n21:06:28.800000 +17:54:00.000000\n21:11:56.256000 +17:54:00.000000\n21:17:23.712000 +17:54:00.000000\n21:06:25.344000 +19:12:00.000000\n21:11:56.256000 +19:12:00.000000\n21:06:22.752000 +20:30:00.000000\n21:22:59.808000 +17:54:00.000000\n21:11:56.256000 +20:30:00.000000\n21:28:27.264000 +17:54:00.000000\n\nNo credible counterpart candidate was identified in the above fields.\n\nIn addition, we also imaged the localization region of the HAWC \ngamma-ray counterpart candidate (GCN #26472) during the searching, which \nis inside the localization region of the IceCube neutrino counterpart \ncandidate (GCN #26460). Four out of nine GLADE galaxies were covered, as \nfollows:\n\n| RAJ2000    | DEJ2000   | Dist  | r_SDSS | r_NOWT |\n| ---------- | --------- | ----- |-------- | ---------- |\n| 323.482422 | +5.279632 | 274.4 | 16.50      | 16.52       |\n| 323.056030 | +4.832057 | 219.1 | 15.83      | 15.84       |\n| 323.173767 | +4.467985 | 292.5 | 16.10      | 16.20       |\n| 323.034882 | +4.482058 | 340.7 | 16.24      | 16.13       |\n\nAll NOWT measurements are consistent with the SDSS values. Any \nsignificant optical transient within these galaxies can be ruled out.\n\nFurthermore, we imaged the HAWC region again, started at 13:09:43.0 UT \non 2019-12-18, with 200 s for each exposure in R-band. Our results are \nas follows:\n\n| RAJ2000    | DEJ2000   | Dist  | r_SDSS | r_NOWT |\n| ---------- | --------- | ----- |-------- | ---------- |\n| 323.482422 | +5.279632 | 274.4 | 16.50  | 16.51       |\n| 323.056030 | +4.832057 | 219.1 | 15.83  | 15.85       |\n| 322.921936 | +5.503483 | 232.2 | 15.57  | 15.60       |\n| 322.838806 | +5.255421 | 179.3 | 15.41  | 15.65       |\n| 322.821228 | +5.553754 | 338.7 | 15.83  | 15.70       |\n| 322.749084 | +5.108610 | 330.8 | 15.94  | 15.90       |\n| 323.173767 | +4.467985 | 292.5 | 16.10  | 16.20       |\n| 322.906006 | +5.850705 | 323.1 | 16.84  | 16.87       |\n| 323.034882 | +4.482058 | 340.7 | 16.24  | 16.12       |\n\nAgain the NOWT measurements are consistent with the SDSS values. Any \nsignificant optical transient within these galaxies can be ruled out.",
  "circularId": 26488,
  "createdOn": 1576693903000,
  "email": "dxu@nao.cas.cn",
  "subject": "LIGO/Virgo S191213g: No counterpart candidate in the NOWT observations",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "LIGO/Virgo S191213g"
}