{ "bibcode": "2019GCN.24285....1L", "body": "Bin Li, Hai-bin Zhao (PMO), Dong Xu, Zi-pei Zhu, Bang-yao Yu, Tian-meng \nZhang, Xu Zhou, Chen-zhou Cui, Hui-juan Wang (NAOC), Xue-feng Wu, \nZhi-ping Jin, Tian-rui Sun, Hao Lu, Ge-tu Zhaori, Ren-quan Hong, \nLong-fei Hu (PMO), Xiao-feng Wang, Wen-xiong Li (THU), Li-fan Wang \n(PMO/TAMU), Jin-zhong Liu (XAO), Ji-rong Mao, Jin-ming Bai (YNAO) report \non behalf of the CNEOST collaboration:\n\nWe conducted optical imaging observations for gravitational wave alert \nwith Chinese Near Earth Object Survey Telescope (CNEOST) at Xuyi \nastronomical station in Jiangsu Province, China (32.75N, 118.47E). The \ninformation of observations and preliminary results are listed below.\n\nAlert: LIGO/Virgo S190425z (GCN 24168)\nStartTime (UT): 2019-04-26T11:49:02.152\nEndTime (UT): 2019-04-26T16:36:13.239\nSkycover (Square Degree): 675.0\nTelescope FoV (Square Degree): 9.0\n# id CentRA(Degree) CentDEC(Degree) LimiteMag3\\sigma 5\\sigma 10\\sigma \n Filter\n 1 184.785507 26.824320 20.983 19.969 19.190 \n VR\n 2 192.873947 29.601379 20.944 19.900 19.114 \n VR\n 3 191.960449 32.390297 20.907 19.837 19.004 \n VR\n 4 183.234314 29.591774 21.019 19.959 19.177 \n VR\n 5 179.964020 21.201527 20.947 19.945 19.179 \n VR\n 6 187.898514 26.821241 20.979 19.949 19.173 \n VR\n 7 196.073746 29.603632 20.851 19.799 18.974 \n VR\n 8 189.684692 29.626089 20.875 19.864 19.036 \n VR\n 9 180.602478 23.990540 21.003 19.962 19.217 \n VR\n 10 184.785507 26.824320 20.983 19.969 19.190 \n VR\n 11 192.873947 29.601379 20.944 19.900 19.114 \n VR\n 12 191.960449 32.390297 20.907 19.837 19.004 \n VR\n 13 183.234314 29.591774 21.019 19.959 19.177 \n VR\n 14 198.608170 32.404903 21.028 19.933 19.087 \n VR\n 15 208.536697 32.404457 21.031 19.898 18.917 \n VR\n 16 215.425766 35.189808 20.952 19.912 18.869 \n VR\n 17 211.972580 35.169170 21.062 19.993 19.055 \n VR\n 18 201.739838 35.234352 21.097 20.013 19.149 \n VR\n 19 198.608170 32.404903 21.028 19.933 19.087 \n VR\n 20 208.536697 32.404457 21.031 19.898 18.917 \n VR\n 21 215.425766 35.189808 20.952 19.912 18.869 \n VR\n 22 211.972580 35.169170 21.062 19.993 19.055 \n VR\n 23 201.739838 35.234352 21.097 20.013 19.149 \n VR\n 24 201.873154 32.386822 21.000 19.912 19.094 \n VR\n 25 211.837280 32.391037 21.018 19.956 18.887 \n VR\n 26 216.216324 37.998722 21.074 19.972 18.897 \n VR\n 27 208.568130 35.197506 21.055 19.976 19.012 \n VR\n 28 198.301239 35.218636 21.127 20.040 19.123 \n VR\n 29 218.851593 35.218647 21.162 20.061 19.121 \n VR\n 30 222.244431 35.193432 21.146 20.100 19.256 \n VR\n 31 225.679306 35.158276 21.108 20.102 19.138 \n VR\n 32 229.114594 35.154079 21.109 20.069 19.083 \n VR\n 33 225.053543 29.585041 21.109 20.064 19.101 \n VR\n 34 218.484024 32.397865 21.157 20.051 19.053 \n VR\n 35 223.324417 38.002777 21.197 20.108 19.214 \n VR\n 36 225.081039 32.366611 21.100 20.031 19.062 \n VR\n 37 230.409027 37.977615 20.998 19.982 19.029 \n VR\n 38 228.267899 29.562998 21.050 20.002 19.011 \n VR\n 39 218.608292 29.590960 21.086 20.021 19.093 \n VR\n 40 219.784576 38.000137 21.168 20.108 19.188 \n VR\n 41 221.790970 32.360126 21.181 20.079 19.201 \n VR\n 42 226.883743 37.952568 21.151 20.092 19.148 \n VR\n 43 228.391403 32.370419 21.037 19.996 18.972 \n VR\n 44 221.833221 29.593536 21.120 20.102 19.196 \n VR\n 45 231.493652 29.561152 21.107 20.079 19.090 \n VR\n 46 233.963348 37.967670 21.103 20.118 19.248 \n VR\n 47 239.815979 40.776882 21.177 20.151 19.176 \n VR\n 48 235.000549 32.369446 21.087 20.096 19.212 \n VR\n 49 235.720306 23.978613 21.080 20.069 19.117 \n VR\n 50 231.493652 29.561152 21.107 20.079 19.090 \n VR\n 51 233.963348 37.967670 21.103 20.118 19.248 \n VR\n 52 239.815979 40.776882 21.177 20.151 19.176 \n VR\n 53 235.000549 32.369446 21.087 20.096 19.212 \n VR\n 54 235.720306 23.978613 21.080 20.069 19.117 \n VR\n 55 231.493652 29.561152 21.107 20.079 19.090 \n VR\n 56 233.963348 37.967670 21.103 20.118 19.248 \n VR\n 57 239.815979 40.776882 21.177 20.151 19.176 \n VR\n 58 235.000549 32.369446 21.087 20.096 19.212 \n VR\n 59 235.720306 23.978613 21.080 20.069 19.117 \n VR\n 60 238.067291 26.742233 21.075 20.070 19.136 \n VR\n 61 239.365143 35.179752 21.189 20.223 19.336 \n VR\n 62 244.608307 37.976181 21.162 20.188 19.205 \n VR\n 63 241.650742 32.340134 21.133 20.164 19.229 \n VR\n 64 241.823608 23.950287 21.047 20.079 19.143 \n VR\n 65 238.767471 23.968771 21.065 20.090 19.152 \n VR\n 66 238.319641 32.363117 21.178 20.198 19.319 \n VR\n 67 243.497925 40.747852 21.083 20.105 19.182 \n VR\n 68 242.779221 35.157001 21.160 20.204 19.243 \n VR\n 69 241.178314 26.761927 21.091 20.087 19.140 \n VR\n 70 236.980118 21.171730 21.104 20.122 19.199 \n VR\n 71 237.881577 29.548300 21.096 20.133 19.217 \n VR\n 72 241.073135 37.950817 21.136 20.129 19.225 \n VR\n 73 246.223633 35.124283 21.138 20.113 19.161 \n VR\n 74 241.141617 29.572805 21.075 20.098 19.182 \n VR\n 75 240.004684 21.128513 21.015 20.035 19.122 \n VR\n\nOur vetting procedure based on image difference and machine learning \nhave identified some known sources (thus unrelated to the GW event) such as\n\nOPEM-19fl = AT 2019dje\nOPEM-19fj = SN 2019dek\nOPEM-19fi = SN 2019dhc\nOPEM-19fh = SN 2019dkx\nOPEM-19fg = SN2019cdc\nOPEM-19ff = AT 2019dku\nOPEM-19fe = SN 2019dod\nOPEM-19ex = AT 2019dzt\nOPEM-19ev = AT 2018kud\nOPEM-19eu = AT 2019dxm\nOPEM-19eu = AT 2019dxm\nOPEM-19en = AT 2019cya = ATLAS19ggy = ZTF19aaoyech\nOPEM-19em = AT 2018ivk\n\nNo interesting transient can be reported here. Detailed data analysis is \nstill in progress and any interesting transient will be reported later.", "circularId": 24285, "createdOn": 1556377360000, "email": "dxu@nao.cas.cn", "subject": "LIGO/Virgo S190425z: CNEOST Optical Observations", "submitter": "Dong Xu at NAOC/CAS ", "eventId": "LIGO/Virgo S190425z" }