TITLE: GCN CIRCULAR NUMBER: 24465 SUBJECT: LIGO/Virgo S190510g: CNEOST Follow-Up Observations DATE: 19/05/11 00:03:02 GMT FROM: Bin Li at PMO Bin Li, Hai-bin Zhao (PMO),Dong Xu, Zi-pei Zhu, Bang-Yao Yu,Tian-meng Zhang, Xu Zhou,Chen-zhou Cui, Hui-juan Wang(NAOC), Xue-feng Wu, Zhi-ping Jin, Tian-rui Sun, Hao Lu, Ge-tu Zhaori, Ren-quan Hong, Long-fei Hu (PMO), Xiao-feng Wang, Wen-xiong Li (THU),Li-fan Wang (PMO/TAMU), Tian-meng Zhang, Xu Zhou (NAOC), Jin-zhong Liu (XAO), Ji-rong Mao, Jin-ming Bai (YNAO), report on behalf of the CNEOST collaboration. We conducted optical imaging observations in the 50% localization of the BNS merger candidate, S190510g, detected by LIGO/Virgo (GCN #24442; GCN #24448) with Chinese Near Earth Object Survey Telescope (CNEOST) at Xuyi astronomical station in Jiangsu Province, China (32.75N, 118.47E). The information of observations and preliminary results are listed below. The new resulte will available at http://www.cneost.org/opem/list.php?gdate=2019-05-10 Alert: LIGO/Virgo S190510g (GCN #24442; GCN #24448) StartTime (UT): 2019-05-10T12:50:28.882 EndTime (UT): 2019-05-10T16:08:20.544 Skycover (Square Degree): 468.0 Telescope FoV (Square Degree):9.0 #id CentRA(D) CentDEC(D) LimiteMag3_sig 5_sig 10_sig Filter 1 194.681900 -6.772099 20.146 19.182 18.347 VR 2 193.277298 1.611395 20.388 19.429 18.607 VR 3 201.675400 1.593076 20.333 19.376 18.588 VR 4 201.708038 -1.210821 20.342 19.391 18.584 VR 5 196.550156 -3.985157 20.324 19.372 18.544 VR 6 204.972916 -4.021634 20.392 19.430 18.639 VR 7 200.313248 -6.826698 20.042 19.117 18.268 VR 8 201.741806 -9.605056 20.066 19.137 18.270 VR 9 200.856903 -12.393054 20.072 19.115 18.220 VR 10 196.088699 -9.623263 20.140 19.181 18.356 VR 11 193.260544 -1.180493 20.322 19.363 18.535 VR 12 198.905228 1.592129 20.188 19.226 18.423 VR 13 204.490967 -1.201643 20.353 19.383 18.603 VR 14 196.080017 -1.200560 20.328 19.367 18.539 VR 15 202.159622 -4.002045 20.335 19.389 18.566 VR 16 203.151154 -6.804635 20.197 19.245 18.344 VR 17 198.895706 -9.611844 19.975 19.040 18.193 VR 18 203.697418 -12.420897 20.083 19.142 18.267 VR 19 195.085129 -12.402555 20.104 19.149 18.278 VR 20 193.729477 -3.975807 20.104 19.159 18.360 VR 21 196.057327 1.575039 20.284 19.326 18.509 VR 22 204.475555 1.618571 20.388 19.451 18.648 VR 23 198.890839 -1.214557 20.269 19.288 18.486 VR 24 199.370056 -3.989921 20.349 19.399 18.578 VR 25 205.977844 -6.794784 20.267 19.332 18.478 VR 26 197.471542 -6.809984 20.133 19.183 18.371 VR 27 204.595169 -9.631298 20.081 19.156 18.277 VR 28 197.989578 -12.395603 20.063 19.098 18.233 VR 29 207.799149 -4.024509 20.537 19.600 18.804 VR 30 207.752518 4.390663 20.787 19.850 19.091 VR 31 216.195114 4.405424 20.795 19.866 19.054 VR 32 210.057693 1.565380 20.756 19.814 19.042 VR 33 215.674347 -1.192254 20.882 19.907 19.076 VR 34 210.591507 -4.026485 20.662 19.709 18.878 VR 35 217.247604 -6.805941 20.539 19.622 18.803 VR 36 210.298050 -9.601982 20.422 19.480 18.642 VR 37 207.799149 -4.024509 20.537 19.600 18.804 VR 38 207.752518 4.390663 20.787 19.850 19.091 VR 39 216.195114 4.405424 20.795 19.866 19.054 VR 40 210.057693 1.565380 20.756 19.814 19.042 VR 41 215.674347 -1.192254 20.882 19.907 19.076 VR 42 210.591507 -4.026485 20.662 19.709 18.878 VR 43 217.247604 -6.805941 20.539 19.622 18.803 VR 44 210.298050 -9.601982 20.422 19.480 18.642 VR 45 207.799149 -4.024509 20.537 19.600 18.804 VR 46 207.752518 4.390663 20.787 19.850 19.091 VR 47 216.195114 4.405424 20.795 19.866 19.054 VR 48 210.057693 1.565380 20.756 19.814 19.042 VR 49 215.674347 -1.192254 20.882 19.907 19.076 VR 50 210.591507 -4.026485 20.662 19.709 18.878 VR 51 217.247604 -6.805941 20.539 19.622 18.803 VR 52 210.298050 -9.601982 20.422 19.480 18.642 VR Detailed data analysis is still in progress and any interesting transients will be reported later.