TITLE: GCN CIRCULAR NUMBER: 19208 SUBJECT: LIGO/Virgo G211117: EWE for NOWT follow-up of northern sky DATE: 16/03/19 17:29:52 GMT FROM: Jinzhong Liu at Xinjiang Astronomical Observatory Liu Jinzhong (XAO), Zhang, Yu (XAO); Zhang, Xuan (XAO); Niu, Hubiao (XAO); Pu, guangxin (XAO); Ma, shuguo (XAO); Yang, taozhi (XAO); Song, fangfang(XAO), on behalf of the NOWT group report: We followed up the GraceDB event (event ID: G211117) with Nanshan One-meter Wide field Telescope (NOWT) from Xinjiang Astronomical observatory (XAO). The first observation was observed at UTC 2016:01:21:20:06:20. The first observation reached an exposure time of 100 seconds with V band and approached a limiting magnitude of 19.6 magnitude with a non-detection of EM-trigger during 2 hrs lasting observation. We only report the first observation here, more information will be reported with below. We monitored the sky region constantly since the event, and we anticipated to continue the observation for time-dominant astronomy. Analysis is ongoing, we observed the northern sky range: ========================= Detailed information about the observation is listed below RA DEC EXP UTC number total(hour) limit_mag filter 09:14;28.00 +42:46:38.0 100s 20160121200620 246 2 19.6 V 08:30:48.00 +35:00:00.0 20s 20160204130300 533 11 18.2 B/V/R/I 08:32:40.0 +35:00:00.0 20s 20160211132012 388 10 18.4 B/V/R/I 08:33:20.0 +35:00:00.0 35s 20160214183004 243 6 18.8 B/V/R/I 08:34:48.0 +35:00:00.0 35s 20160219135050 387 9.5 17.2 B/V/R/I 08:36:24.0 +35:00:00.0 35s 20160225130355 763 19.5 19.0 B/V/R/I 08:37:12.0 +35:00:00.0 35s 20160228125352 697 18.5 19.0 B/V/R/I 09:10:09.51 +55:14:23.7 35s 20160306130840 1217 30.5 18.8 B/V/R/I 10:00:00.0 +50:00:00.0 35s 20160310131651 1181 30.5 18.8 B/V/R/I ... ... -- N: Jinzhong Liu, PhD O: Main building, 213 P: 150, Science 1-Street, Urumqi, Xinjiang 830011, China T: 86 991 3689027 D: 2012-07-14 E: optics@xao.ac.cn