TITLE: GCN CIRCULAR NUMBER: 19315 SUBJECT: LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky DATE: 16/04/15 11:17:05 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: This is a time-dominant survey follow-up report of Liu et al. (GCN19208). Each FOV of NOWT was monitored 3 days using standard BVR bands, and it was marked as EWE001, EWE002, EWE003 and EWE004. Note that the calibrated magnitude value of 15 is an assumption as a up-limited magnitude in our caculation. This would imply that EM-trigger of GW sources could not correspond with the brightness targets. Meanwhile all the targets had the value of SNR>10. We reported the photometric variable information during the time-dominant survey as below. 1)Detailed information about the observation of EWE001 (time range: 2016:03:06:13:14:05 to 2016:03:06:23:37:35, 2016:03:08:13:42:24 to 2016:03:08:23:42:55, 2016:03:09:13:15:58 to 2016:03:09:23:27:43) RA DEC Mag(V) M_err Variability-type 137.531483 55.002369 15.265 0.0295 eruptive with irregularity 138.630270 55.123970 15.823 0.0950 periodicity 138.598282 54.811173 16.544 0.1485 eruptive with a dip 136.399169 54.822750 16.208 0.1301 cataclysmic with regularity 2)Detailed information about the observation of EWE002 (time range: 2016:03:10:13:16:56 to 2016:03:10:23:06:05, 2016:03:12:13:17:50 to 2016:03:12:23:34:34, 2016:03:13:13:39:14 to 2016:03:13:23:25:10) RA DEC Mag(V) M_err Variability-type 149.856039 50.518744 15.258 0.0215 eruptive with a dip 149.570337 49.430700 15.976 0.0590 periodicity 149.823531 50.014876 16.249 0.0566 eruptive with a dip 149.281069 50.077445 17.436 0.1037 fast oscillation 149.828243 50.145567 17.894 0.1390 eruptive with a dip 149.831656 50.168234 16.148 0.0402 eruptive with double dips 150.894291 50.252967 16.218 0.1062 pulsating 149.269826 50.234558 16.994 0.1039 eruptive with double dips 3)Detailed information about the observation of EWE003 (time range: 2016:03:21:14:07:32 to 2016:03:21:23:17:36, 2016:03:22:13:28:44 to 2016:03:22:22:57:18, 2016:03:23:13:38:56 to 2016:03:23:22:30:22) RA DEC Mag(V) M_err Variability-type 151.734041 49.563742 15.804 0.1241 eruptive with double dips 151.413957 49.553095 15.107 0.1846 periodicity 4)Detailed information about the observation of EWE004 (time range: 2016:03:24:13:30:26 to 2016:03:24:22:41:01, 2016:03:27:15:12:19 to 2016:03:27:23:05:59, 2016:03:28:16:09:54 to 2016:03:28:23:05:07) RA DEC Mag(V) M_err Variability-type 152.055858 48.805903 15.183 0.1058 periodicity 152.626914 48.925828 15.193 0.0503 fast oscillation 152.917431 48.942816 15.131 0.0606 eruptive with a tuber 151.415220 49.552819 15.237 0.0741 eclipsing 151.142881 49.586450 15.450 0.0488 eruptive with three dips 151.936807 48.837133 15.695 0.0494 fast oscillation 152.207676 48.715853 17.186 0.1914 periodicity Note: 21 targets can be found as the photometric variability, and the follow-up of spectrograph observation should be important next. Analysis is ongoing. -- 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