TITLE:   GCN CIRCULAR
NUMBER:  22395
SUBJECT: GRB 180205A: Nanshan-1m optical observations
DATE:    18/02/06 12:02:12 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>

Z.P. Zhu, H.X. Feng, D. Xu (NAOC), B.Y. Yu (HNU), J.H. Liu, X. Zhang, 
H.B. Niu, S.G. Ma, J.Z. Liu, A. Esamdin, L. Ma, Y. Zhang (XAO) report on 
behalf of a larger collaboration:

We observed the field of GRB 180205A (Evens et al., GCN 22381) using the 
1m telescope located at Nanshan, Xinjiang, China, and 10x60s R-band 
frames, starting at 16:31:07 UT on 2018-02-05.

The optical afterglow (e.g., Evens et al., GCN 22381; Zheng et al., GCN 
22382) is clearly detected in our stacked image.

Preliminary photometry results are as follows:

Tmid-T0  Exposure  Filter   Mag   MagErr
  (hr)           (s)
12.15     10x60       R       19.67    0.10

Photometry is calibrated with nearby SDSS stars, and errors are only 
statistical values.