[vsnet-grb-info 23018] LIGO/Virgo S190718y: No counterpart candidates in CNEOST

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25117
SUBJECT: LIGO/Virgo S190718y: No counterpart candidates in CNEOST
DATE:    19/07/20 05:11:09 GMT
FROM:    Bin Li at PMO  <binli at pmo.ac.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 S190718y (GCN 25087)
StartTime (UT):               2019-07-19T12:41:19.523       
EndTime (UT):                 2019-07-19T18:19:52.108       
Skycover (Square Degree):     639.0   
Telescope FoV (Square Degree):9.0     
#id CentRA(D) CentDEC(D) LimiteMag3_sig 5_sig 10_sig Filter 
  1 208.869080  -6.786121   20.178   19.181   18.177   SR
  2 207.332977  -1.223906   20.265   19.261   18.376   SR
  3 210.666458  -4.041420   20.254   19.265   18.329   SR
  4 216.043030  -9.596825   20.185   19.217   18.256   SR
  5 217.903732 -15.211738   19.997   18.994   17.997   SR
  6 215.287582 -12.401288   19.966   19.002   18.058   SR
  7 210.364441  -9.628950   20.049   19.056   18.076   SR
  8 207.832382  -4.038251   20.262   19.259   18.324   SR
  9 210.156891  -1.234565   20.318   19.323   18.407   SR
 10 211.684143  -6.830252   20.100   19.149   18.213   SR
 11 220.779205 -15.240459   19.922   18.975   18.015   SR
 12 208.869080  -6.786121   20.178   19.181   18.177   SR
 13 210.156891  -1.234565   20.318   19.323   18.407   SR
 14 211.684143  -6.830252   20.100   19.149   18.213   SR
 15 216.043030  -9.596825   20.185   19.217   18.256   SR
 16 220.779205 -15.240459   19.922   18.975   18.015   SR
 17 215.287582 -12.401288   19.966   19.002   18.058   SR
 18 306.185486  23.842829   19.291   18.356   17.303   SR
 19 305.508270  29.443697   19.330   18.419   17.469   SR
 20 307.824493  35.063766   19.557   18.656   17.621   SR
 21 312.000488  37.857952   19.497   18.596   17.475   SR
 22 314.533600  32.205532   19.391   18.475   17.317   SR
 23 308.675293  29.416243   19.335   18.435   17.488   SR
 24 305.508270  29.443697   19.330   18.419   17.469   SR
 25 307.824493  35.063766   19.557   18.656   17.621   SR
 26 312.000488  37.857952   19.497   18.596   17.475   SR
 27 314.533600  32.205532   19.391   18.475   17.317   SR
 28 307.880554  32.229843   19.462   18.527   17.523   SR
 29 307.028320  26.640734   19.367   18.468   17.454   SR
 30 304.380890  35.047928   19.489   18.588   17.431   SR
 31 309.932098  40.646816   19.639   18.729   17.591   SR
 32 311.208282  35.018509   19.474   18.566   17.400   SR
 33 314.533600  32.205532   19.391   18.475   17.317   SR
 34 307.880554  32.229843   19.462   18.527   17.523   SR
 35 308.223480   1.420728   18.660   17.754   16.915   SR
 36 309.839081   9.804000   18.793   17.888   16.974   SR
 37 312.659424   9.800121   18.743   17.836   16.908   SR
 38 309.607025  18.222225   18.980   18.071   17.074   SR
 39 306.655151  18.243509   19.021   18.088   17.056   SR
 40 312.075226  21.049301   19.014   18.083   17.079   SR
 41 318.466370  18.222324   18.949   18.017   16.982   SR
 42 313.774658  15.433895   19.007   18.055   17.062   SR
 43 322.525757  15.434681   18.984   18.004   16.987   SR
 44 315.705475  12.637063   18.935   18.010   17.033   SR
 45 321.214417   9.811152   18.731   17.783   16.832   SR
 46 316.081055   7.014183   18.795   17.842   16.921   SR
 47 311.754395   4.228014   18.686   17.775   16.887   SR
 48 313.776703  -1.401701   18.251   17.366   16.533   SR
 49 308.223480   1.420728   18.660   17.754   16.915   SR
 50 309.839081   9.804000   18.793   17.888   16.974   SR
 51 310.891296  15.423524   18.974   18.075   17.106   SR
 52 306.073547  21.013973   19.140   18.213   17.172   SR
 53 315.045715  21.008123   18.907   17.995   17.038   SR
 54 315.521973  18.200771   18.994   18.056   17.059   SR
 55 316.691681  15.434895   18.960   18.034   17.055   SR
 56 322.525757  15.434681   18.984   18.004   16.987   SR
 57 318.607544  12.637962   18.854   17.920   16.948   SR
 58 318.352875   9.810987   18.740   17.819   16.888   SR
 59 318.875336   7.004980   18.767   17.841   16.919   SR
 60 314.550995   4.224255   18.699   17.756   16.866   SR
 61 313.830048   1.406936   18.628   17.684   16.804   SR
 62 308.185730  -1.344688   18.493   17.572   16.766   SR
 63 310.401428   7.007415   18.797   17.879   16.966   SR
 64 312.835144  12.623907   18.896   17.977   17.014   SR
 65 309.607025  18.222225   18.980   18.071   17.074   SR
 66 306.073547  21.013973   19.140   18.213   17.172   SR
 67 318.466370  18.222324   18.949   18.017   16.982   SR
 68 313.774658  15.433895   19.007   18.055   17.062   SR
 69 319.574982  15.416553   18.978   18.053   17.063   SR
 70 321.712860   7.031455   18.669   17.751   16.811   SR
 71 325.777649  26.589394   15.121   14.167   13.528   SR

Detailed data analysis is still in progress and any interesting transients will be reported later.
The new resulte will available at http://www.cneost.org/opem/list.php?gdate=2019-07-19 <http://www.cneost.org/opem/list.php?gdate=2019-07-19>

We aslo detect the  source — MASTER OT J203053.79+384020.1 / AT2019lly (Lipunov et al., GCN #25105) in our survey, which are labeled OPEM-19vs ( http://www.cneost.org/opem/findname.php?opemname=OPEM-19vs <http://www.cneost.org/opem/findname.php?opemname=OPEM-19vs> ). And, a point source (r=16.32 +- 0.04 ,observed 2017-11-03) is present in the archive  catalog  of CNEOST at the location of AT2019lly.