TITLE:   GCN CIRCULAR
NUMBER:  24190
SUBJECT: LIGO/Virgo S190425z: Xinglong/Schmidt follow-up observations
DATE:    19/04/25 16:21:40 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>

Dong Xu, Zi-Pei Zhu, Bang-Yao Yu, Tian-Meng Zhang, Xu Zhou, Xiao-Ming 
Teng, Peng-Fei Liu, Xiang-Nan Guan (NAOC), Sheng Yang (INAF-OAPd), 
Hai-Bin Zhao, Bin Li (PMO), Jin-Zhong Liu, Hu-Biao Niu, Jun-Hui Liu, 
Xuan Zhang (XAO), Ji-Rong Mao, Jin-Ming Bai (YNAO), Xing Gao (Urumqi 
No.1 Senior High School) report on behalf of the GWFUNC
collaboration:

We performed the search for the optical counterpart of LIGO/Virgo 
S190425z (GCN 24168) using the 0.9-m Schmidt telescope located at 
Xinglong, Hebei, China. Observations started at 12:40:09 UT on 
2019-04-25 and ended at 13:42:18 UT on 2019-04-25, and the 1.5 x 1.5 
deg^2 imager scanned high probability regions of the LVC localization 
that are accessible to the Xinglong/Schmidt telescope. The unfiltered 
images were taken with 60 sec exposure time and typical limiting depth 
is around 18 mag.

The searching was stopped by growing heavy clouds. Listed below are the 
field centers
observed.

RA(J2000)      DEC(J2000)
15:01:34.100 +29:55:26.00
15:01:29.990 +31:25:33.00
15:01:30.100 +32:55:36.00
15:08:22.990 +29:55:27.00
15:08:33.290 +31:25:29.00
15:08:37.090 +32:55:24.00
15:15:20.500 +29:55:46.00
15:15:34.890 +31:25:28.00
15:15:40.000 +32:54:55.00
14:43:21.790 +34:25:01.00
14:43:19.900 +35:54:50.00
14:43:19.590 +37:24:42.00
14:50:26.690 +34:25:58.00
14:50:44.790 +35:55:17.00
14:50:38.800 +37:24:51.00
14:57:44.190 +34:25:15.00
14:58:09.000 +35:55:29.00
14:58:07.900 +37:25:22.00
15:22:27.600 +29:55:45.00
15:22:37.500 +31:25:34.00
15:22:37.190 +32:55:04.00
15:29:39.890 +29:55:55.00
15:29:35.400 +31:26:06.00
15:29:39.600 +32:55:48.00
14:21:09.600 +34:24:48.00
14:21:03.590 +35:54:44.00
14:21:05.100 +37:24:14.00
14:28:32.890 +34:24:47.00
14:28:31.000 +35:54:32.00
14:28:30.400 +37:24:52.00
14:35:40.790 +34:24:50.00
14:35:55.700 +35:54:37.00
14:35:56.300 +37:23:56.00
15:06:26.900 +34:25:18.00
15:06:06.990 +35:55:32.00

Data analysis is ongoing. Optical transient(s) from the above fields, if 
interesting, will be
reported later.