TITLE:   GCN CIRCULAR
NUMBER:  24234
SUBJECT: LIGO/Virgo S190425z: YAHPT Optical Observation
DATE:    19/04/26 16:14:19 GMT
FROM:    Tianrui Sun at Purple Mountain Obs,CAS  <trsun@pmo.ac.cn>

Tianrui Sun,Jian Chen,Lei Hu,Fan Li, Ye Yuan, Yanning Fu, Yue Chen., Xuefeng Wu,Kelai Meng(PMO), Wen-xiong Li, Xinghan Zhang,Xiao-feng Wang(THU), Lifan Wang(PMO and TAMU)

We report the observations of the BAYESTAR skymap with GLADE catalogue of the BNS event S190425z,
(The LIGO Scientific Collaboration and the Virgo Collaboration, GCN 24168) with the Yaoan High Precision Telescope at Yaoan Observation Station(in Yunnan Province, China(101.1811¡ã E,25.528¡ãN)), Purple Mountain Observatory.
We obtained images of ZTF19aarzaod and ZTF19aarykkb (Kasliwal et al., GCN 24191) in Rc band with exposure time 300s and calibrated to the PPMX catalogue. We performed image subtraction with template from PS1 r band images.

Object  ObserveTime  Band  Mag(Magerr) 
ZTF19aarykkb| 2019-04-25T19:10:32  |Rc  | 18.33(0.08)
ZTF19aarykkb| 2019-04-25T19:15:47  |Rc  | 18.33(0.08)
ZTF19aarykkb| 2019-04-25T19:21:03  |Rc  | 18.00(0.12)
ZTF19aarykkb| 2019-04-25T19:26:18  |Rc  | 18.39(0.09)
ZTF19aarykkb| 2019-04-25T19:31:34  |Rc  | 18.29(0.08)
ZTF19aarykkb| 2019-04-25T20:12:02  |Rc  | 18.28(0.08)
ZTF19aarykkb| 2019-04-25T20:33:53  |Rc  | 18.35(0.08)
ZTF19aarykkb| 2019-04-25T21:06:48  |Rc  | 18.15(0.14)
ZTF19aarykkb| 2019-04-25T21:17:44  |Rc  | 18.04(0.12)
ZTF19aarykkb| 2019-04-25T21:28:46  |Rc  | 18.09(0.11)
ZTF19aarykkb| 2019-04-25T21:39:43  |Rc  | 18.00(0.12)
ZTF19aarykkb| 2019-04-25T21:50:34  |Rc  | 18.04(0.12)
Object  ObserveTime  Band Type  Mag(Magerr)
ZTF19aarzaod| 2019-04-25T19:47:31  |Rc |Mag Subtract | 18.98(0.59)
ZTF19aarzaod| 2019-04-25T21:34:10  |Rc |Mag Limit | 18.87(0.51)
ZTF19aarzaod| 2019-04-25T19:42:15  |Rc |Mag Limit | 18.97(0.40)
ZTF19aarzaod| 2019-04-25T21:45:01  |Rc |Mag Limit | 18.88(0.52)
ZTF19aarzaod| 2019-04-25T20:50:21  |Rc |Mag Subtract | 18.92(0.56)
ZTF19aarzaod| 2019-04-25T20:39:21  |Rc |Mag Limit | 18.98(0.52)
ZTF19aarzaod| 2019-04-25T20:28:20  |Rc |Mag Subtract | 18.96(0.60)
ZTF19aarzaod| 2019-04-25T21:01:16  |Rc |Mag Subtract | 18.88(0.52)
ZTF19aarzaod| 2019-04-25T21:23:13  |Rc |Mag Subtract | 18.91(0.61)
ZTF19aarzaod| 2019-04-25T21:12:12  |Rc |Mag Limit | 18.93(0.57)
ZTF19aarzaod| 2019-04-25T19:37:00  |Rc |Mag Limit | 18.99(0.55)