GCN Circular 24315

L.P. Xin (NAOC), X.H. Han (NAOC), J.Y. Wei (NAOC), C. Wu (NAOC), 
D. Turpin (NAOC), J.G. Ducoin (CNRS/LAL), D. Corre (CNRS/LAL), 
L. Huang (NAOC), Y. Xu (NAOC), H.B. Cai (NAOC), J. Wang (NAOC), 
X.M. Lu (NAOC), Y.L. Qiu (NAOC), J.S. Deng (NAOC), L. Jia (NAOC), 
S.C. Zou (NAOC), S.F. Liu (NAOC), Q.C. Feng (NAOC), H.L. Li (NAOC), 
D.W. Xu (NAOC), Y.J. Xiao (NAOC), W.L. Dong (NAOC), Y.T. Zheng (NAOC), 
P. P. Zhang (NAOC), R.S. Zhang (NAOC), E.W. Liang (GXU), 
X.G. Wang (GXU),  Z.G. Dai (NJU), X.Y. Wang (NJU), Y.G. Yang (HBNU), 
J.R. Mao (YNAO),  B. Cordier (CEA/AIM), S. Basa (CNRS/LAM), 
J.L. Atteia (UPS/IRAP),  D. G��tz (CEA/AIM),  A. Claret (CEA/AIM), 
N. Leroy (CNRS/LAL), C. Lachaud (CNRS/APC), S. Antier (CNRS/APC/CNES), 
S.N. Zhang (IHEP), B.B. Wu (IHEP),  report on behalf of the SVOM Ground Follow-up Group:

We observed the LIGO/Virgo trigger S190425z with GWAC-F60A.
Two 60cm GWAC-F60(A/B) are operated by Guangxi University and NAOC,
CAS, at Xinglong Observatory. China. They are equipped with Standard
Johnson filters and 2Kx2K Andor CCD (FOV~18x18 arcmin). GWAC-F60(A/B)
are used for galaxy-targeted observations. The galaxies are selected
from the GLADE catalog (Version 2.3, Dalya et al. 2018) in the probability
skymap of GW event. All these galaxies were observed in clear band. 
The weather was not good during the  observations.

The first image was taken ~6 hours after the event trigger. No credible
new source was detected in our pipeline. A total number of
80 galaxies were observed. The coordinates (J2000) of galaxies,
the observation time, the limit magnitude (3sigma) and telescopes 
are listed below:

 # Ra	     Dec            start-obs(UTC)   Limit (R)     Telescope
246.40900  16.45500   2019-04-25T14:07:30.157  16.86  F60A
235.47600  28.13410   2019-04-25T12:26:20.678  20.16  F60A
236.94100  28.64190   2019-04-25T13:38:20.485  18.81  F60A
186.25200  28.55850   2019-04-25T12:14:11.215  20.25  F60A
241.23600  23.93290   2019-04-25T13:09:22.662  16.66  F60A
243.74100  21.93830   2019-04-25T13:49:55.528  14.15  F60A
246.11400  19.48260   2019-04-25T13:44:10.488  16.35  F60A
247.40100  15.65840   2019-04-25T14:03:29.676  17.11  F60A
252.98900  4.38356    2019-04-26T15:14:39.330  20.03  F60A
253.53600  -7.63537   2019-04-26T15:41:09.103  19.00  F60A
248.25700  22.79720   2019-04-26T16:18:33.855  18.88  F60A
246.40900  16.45500   2019-04-26T13:39:32.350  19.24  F60A
242.31500  25.71250   2019-04-26T13:29:26.576  18.96  F60A
101.82200  33.56730   2019-04-26T13:03:41.172  18.12  F60A
213.21400  35.71070   2019-04-26T19:31:21.044  15.55  F60A
252.26500  -17.64590  2019-04-26T18:17:23.676  15.12  F60A
213.61300  36.40440   2019-04-26T19:12:15.038  16.48  F60A
252.69500  4.60474    2019-04-26T15:10:41.648  18.50  F60A
253.24500  2.40099    2019-04-26T15:06:31.427  18.98  F60A
252.92700  -2.61525   2019-04-26T15:30:55.776  18.12  F60A
251.59400  9.03763    2019-04-26T14:23:38.733  17.37  F60A
188.92200  26.52300   2019-04-26T12:50:39.801  19.69  F60A
236.90100  26.06370   2019-04-26T12:40:17.254  19.40  F60A
252.71300  8.78387    2019-04-26T15:57:48.620  18.05  F60A
216.14600  35.27980   2019-04-26T13:12:20.095  18.89  F60A
256.23700  -1.53050   2019-04-26T19:27:31.002  14.74  F60A
239.01600  24.44800   2019-04-26T18:58:18.867  16.39  F60A
240.75100  27.01030   2019-04-26T12:36:02.920  18.67  F60A
246.06300  20.18360   2019-04-26T14:06:52.457  18.67  F60A
256.68100  -4.93311   2019-04-26T19:42:41.710  14.82  F60A
236.97500  25.72940   2019-04-26T16:10:06.932  18.87  F60A
189.55500  28.93690   2019-04-26T12:03:09.117  18.55  F60A
203.60500  34.69040   2019-04-26T12:59:12.069  19.63  F60A
240.68800  25.25220   2019-04-26T14:45:39.591  19.17  F60A
251.85200  -20.14170  2019-04-26T18:25:26.961  13.73  F60A
252.33700  -17.64450  2019-04-26T16:46:18.132  14.91  F60A
254.52400  -21.27410  2019-04-26T18:29:34.531  13.66  F60A
265.63300  0.21675    2019-04-26T18:54:30.920  13.77  F60A
252.72300  -15.00400  2019-04-26T16:22:46.980  16.61  F60A
217.50600  36.36090   2019-04-26T19:08:30.994  16.65  F60A
242.40600  28.05180   2019-04-26T14:31:48.522  19.80  F60A
258.11900  -9.12416   2019-04-26T16:26:50.153  16.71  F60A
218.40500  35.96650   2019-04-26T14:11:05.568  19.82  F60A
200.21300  43.96540   2019-04-26T12:26:20.960  19.19  F60A
243.14800  29.48450   2019-04-26T19:16:03.251  16.82  F60A
208.41000  36.13420   2019-04-26T13:33:42.807  19.49  F60A
249.86000  11.21050   2019-04-26T14:27:45.663  19.03  F60A
216.08600  36.46140   2019-04-26T12:16:57.909  19.57  F60A
190.43600  35.06290   2019-04-26T13:08:04.914  19.41  F60A
212.69800  35.91340   2019-04-26T12:08:27.646  19.09  F60A
243.14800  29.48480   2019-04-26T18:42:22.185  16.77  F60A
251.94600  -7.21269   2019-04-26T16:30:59.956  16.95  F60A
203.64600  34.77790   2019-04-26T19:19:52.570  15.29  F60A
253.27000  -16.29090  2019-04-26T18:13:21.035  15.42  F60A
221.59100  32.78010   2019-04-26T13:20:54.590  20.53  F60A
182.57600  26.43080   2019-04-26T14:19:29.899  20.04  F60A
243.14700  29.36490   2019-04-26T19:35:09.298  15.77  F60A
252.07700  6.31221    2019-04-26T14:53:56.092  18.74  F60A
254.78000  -5.74199   2019-04-26T15:45:20.977  17.63  F60A
253.60000  -9.88924   2019-04-26T16:01:51.545  16.91  F60A
193.51000  29.60370   2019-04-26T13:25:15.579  19.72  F60A
194.91500  53.34130   2019-04-26T12:12:42.478  20.34  F60A
242.27700  24.87030   2019-04-26T18:46:29.445  15.58  F60A
260.77200  12.69540   2019-04-26T16:05:56.399  17.81  F60A
256.25200  -1.54133   2019-04-26T19:38:57.637  14.77  F60A
253.72400  -16.95200  2019-04-26T16:50:26.458  14.38  F60A
205.41500  55.67070   2019-04-26T16:14:20.651  19.45  F60A
252.09000  6.22276    2019-04-26T14:49:46.057  18.45  F60A
196.48300  53.65920   2019-04-26T16:35:23.719  18.93  F60A
240.66900  37.35940   2019-04-26T12:21:33.662  19.43  F60A
252.38800  6.01625    2019-04-26T14:57:55.285  18.43  F60A
253.03200  -17.05380  2019-04-26T18:21:23.262  14.86  F60A
254.50500  -1.82269   2019-04-26T15:26:51.357  17.91  F60A
240.36900  22.42770   2019-04-26T14:15:09.801  19.36  F60A
232.92900  40.86490   2019-04-26T13:16:36.533  20.10  F60A
243.89800  19.45340   2019-04-26T18:50:43.803  15.42  F60A
255.21800  2.10185    2019-04-26T15:18:42.705  18.77  F60A
197.38900  53.49420   2019-04-26T12:31:38.012  20.40  F60A
250.01400  15.88340   2019-04-26T14:02:46.419  19.04  F60A
245.79700  16.93260   2019-04-26T13:58:39.077  19.32  F60A


This circular is citable.