TITLE:   GCN CIRCULAR
NUMBER:  24697
SUBJECT: GRB 190530A: Xinglong 2.16m optical observation
DATE:    19/05/31 21:29:02 GMT
FROM:    Liping Xin at NAOC, SVOM  <xlp@nao.cas.cn>

L. P. Xin,  J. B. Zhang, G. W. Li,  R. S. Zhang,  T. C. Zheng, J. Wang,  
J. Y. Wei,   Y. G. Yang, E. W. Liang,  X. G. Wang,   H. L. Li, X. H. Han,  
X. M. Lu,  L. Huang,    H. B. Cai,   Y. L. Qiu,  Y. Xu, Y.  J. Xiao, 
Y. T. Zheng,  C. Wu,   J. S. Deng,  D. W. Xu,  D. Turpin, 
W. L. Dong, P. P. Zhang and Jirong Mao report:

We observed Fermi GRB 190530A  (Fermi GBM Team, GCN Circ. 24676; 
Longo et al., GCN Circ. 24679)  using the  Xinglong-2.16m equipped with 
the BFOSC camera. Observations were carried out from 12:49:45 to 
13:40:10 UT on 2019-05-31, 62*50sec R band images were obtained.

The optical afterglow (Lipunov et al., GCN 24680, 24693; Kann et al., GCN Circ 24684; 
Melandri et al., GCN Circ. 24689; Heintz et al., GCN Circ 24686; Lzzo et al., GCN Circ 24687; 
Xin et al., GCN Circ 24688; Watson et al., GCN Circ.24690) was clearly detected in our 
stacked image with a magnitude of R=19.63+/-0.1 mag at the mid time of about 1.12 days 
after the burst, calibrated with nearby SDSS stars