GCN Circular 24285
Subject
LIGO/Virgo S190425z: CNEOST Optical Observations
Date
2019-04-27T15:02:40Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
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), Jin-zhong Liu (XAO), Ji-rong Mao, Jin-ming Bai (YNAO) report
on behalf of the CNEOST collaboration:
We conducted optical imaging observations for gravitational wave alert
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.
Alert: LIGO/Virgo S190425z (GCN 24168)
StartTime (UT): 2019-04-26T11:49:02.152
EndTime (UT): 2019-04-26T16:36:13.239
Skycover (Square Degree): 675.0
Telescope FoV (Square Degree): 9.0
# id CentRA(Degree) CentDEC(Degree) LimiteMag3\sigma 5\sigma 10\sigma
Filter
1 184.785507 26.824320 20.983 19.969 19.190
VR
2 192.873947 29.601379 20.944 19.900 19.114
VR
3 191.960449 32.390297 20.907 19.837 19.004
VR
4 183.234314 29.591774 21.019 19.959 19.177
VR
5 179.964020 21.201527 20.947 19.945 19.179
VR
6 187.898514 26.821241 20.979 19.949 19.173
VR
7 196.073746 29.603632 20.851 19.799 18.974
VR
8 189.684692 29.626089 20.875 19.864 19.036
VR
9 180.602478 23.990540 21.003 19.962 19.217
VR
10 184.785507 26.824320 20.983 19.969 19.190
VR
11 192.873947 29.601379 20.944 19.900 19.114
VR
12 191.960449 32.390297 20.907 19.837 19.004
VR
13 183.234314 29.591774 21.019 19.959 19.177
VR
14 198.608170 32.404903 21.028 19.933 19.087
VR
15 208.536697 32.404457 21.031 19.898 18.917
VR
16 215.425766 35.189808 20.952 19.912 18.869
VR
17 211.972580 35.169170 21.062 19.993 19.055
VR
18 201.739838 35.234352 21.097 20.013 19.149
VR
19 198.608170 32.404903 21.028 19.933 19.087
VR
20 208.536697 32.404457 21.031 19.898 18.917
VR
21 215.425766 35.189808 20.952 19.912 18.869
VR
22 211.972580 35.169170 21.062 19.993 19.055
VR
23 201.739838 35.234352 21.097 20.013 19.149
VR
24 201.873154 32.386822 21.000 19.912 19.094
VR
25 211.837280 32.391037 21.018 19.956 18.887
VR
26 216.216324 37.998722 21.074 19.972 18.897
VR
27 208.568130 35.197506 21.055 19.976 19.012
VR
28 198.301239 35.218636 21.127 20.040 19.123
VR
29 218.851593 35.218647 21.162 20.061 19.121
VR
30 222.244431 35.193432 21.146 20.100 19.256
VR
31 225.679306 35.158276 21.108 20.102 19.138
VR
32 229.114594 35.154079 21.109 20.069 19.083
VR
33 225.053543 29.585041 21.109 20.064 19.101
VR
34 218.484024 32.397865 21.157 20.051 19.053
VR
35 223.324417 38.002777 21.197 20.108 19.214
VR
36 225.081039 32.366611 21.100 20.031 19.062
VR
37 230.409027 37.977615 20.998 19.982 19.029
VR
38 228.267899 29.562998 21.050 20.002 19.011
VR
39 218.608292 29.590960 21.086 20.021 19.093
VR
40 219.784576 38.000137 21.168 20.108 19.188
VR
41 221.790970 32.360126 21.181 20.079 19.201
VR
42 226.883743 37.952568 21.151 20.092 19.148
VR
43 228.391403 32.370419 21.037 19.996 18.972
VR
44 221.833221 29.593536 21.120 20.102 19.196
VR
45 231.493652 29.561152 21.107 20.079 19.090
VR
46 233.963348 37.967670 21.103 20.118 19.248
VR
47 239.815979 40.776882 21.177 20.151 19.176
VR
48 235.000549 32.369446 21.087 20.096 19.212
VR
49 235.720306 23.978613 21.080 20.069 19.117
VR
50 231.493652 29.561152 21.107 20.079 19.090
VR
51 233.963348 37.967670 21.103 20.118 19.248
VR
52 239.815979 40.776882 21.177 20.151 19.176
VR
53 235.000549 32.369446 21.087 20.096 19.212
VR
54 235.720306 23.978613 21.080 20.069 19.117
VR
55 231.493652 29.561152 21.107 20.079 19.090
VR
56 233.963348 37.967670 21.103 20.118 19.248
VR
57 239.815979 40.776882 21.177 20.151 19.176
VR
58 235.000549 32.369446 21.087 20.096 19.212
VR
59 235.720306 23.978613 21.080 20.069 19.117
VR
60 238.067291 26.742233 21.075 20.070 19.136
VR
61 239.365143 35.179752 21.189 20.223 19.336
VR
62 244.608307 37.976181 21.162 20.188 19.205
VR
63 241.650742 32.340134 21.133 20.164 19.229
VR
64 241.823608 23.950287 21.047 20.079 19.143
VR
65 238.767471 23.968771 21.065 20.090 19.152
VR
66 238.319641 32.363117 21.178 20.198 19.319
VR
67 243.497925 40.747852 21.083 20.105 19.182
VR
68 242.779221 35.157001 21.160 20.204 19.243
VR
69 241.178314 26.761927 21.091 20.087 19.140
VR
70 236.980118 21.171730 21.104 20.122 19.199
VR
71 237.881577 29.548300 21.096 20.133 19.217
VR
72 241.073135 37.950817 21.136 20.129 19.225
VR
73 246.223633 35.124283 21.138 20.113 19.161
VR
74 241.141617 29.572805 21.075 20.098 19.182
VR
75 240.004684 21.128513 21.015 20.035 19.122
VR
Our vetting procedure based on image difference and machine learning
have identified some known sources (thus unrelated to the GW event) such as
OPEM-19fl = AT 2019dje
OPEM-19fj = SN 2019dek
OPEM-19fi = SN 2019dhc
OPEM-19fh = SN 2019dkx
OPEM-19fg = SN2019cdc
OPEM-19ff = AT 2019dku
OPEM-19fe = SN 2019dod
OPEM-19ex = AT 2019dzt
OPEM-19ev = AT 2018kud
OPEM-19eu = AT 2019dxm
OPEM-19eu = AT 2019dxm
OPEM-19en = AT 2019cya = ATLAS19ggy = ZTF19aaoyech
OPEM-19em = AT 2018ivk
No interesting transient can be reported here. Detailed data analysis is
still in progress and any interesting transient will be reported later.