[vsnet-grb-info 20296] GRB 180205A: Xinglong TNT optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22392
SUBJECT: GRB 180205A:  Xinglong TNT optical observation
DATE:    18/02/06 02:43:28 GMT
FROM:    L.P. Xin at NAOC  <xlp at nao.cas.cn>

L. P. Xin,   F. Q. Pi,  J. Y. Wei,  Y. L. Qiu, J. S. Deng,  
J. Wang,  X. H. Han, X. M. Meng, C. Wu, D. TURPIN, H. L. Li report:

We began to observe GRB 180205A  (Evens et al., GCN 22381)  
with Xinglong  0.8-m TNT telescope, China,  at 2018-02-05, 16:11:42(UT),
about 12.6 hours the burst.

We obtained several  R-band images with an exposure time of 300 sec for each frame.  
The optical afterglow (Evens et al., GCN 22381; Zheng et al., GCN 22382; 
Bolmer et al., GCN 22383, 22391; Tanvir et al., GCN 22384;  Volnova et al., GCN 22387,
Wiersema et al., GCN 22388; Falcon et al., 22390 ) is clearly detected in our stacked image with 5*300 sec.
The brightness is estimated to be about R~19.97 mag  calibrated 
by USNO B1.0 R2 mag at about 12.7 hours after the burst,

We acknowledge the excellent support from Xinglong staff Miao Zhang.