GCN Circular 37109

Xuhui Han (NAOC), Zhe Kang (CHO), Liping Xin (NAOC),Chao Wu (NAOC),
Xiaomeng Lu (NAOC), Pinpin Zhang (NAOC), Ruosong Zhang (NAOC)，You Lv
(CHO)，Yujie Xiao(NAOC),  Yulei Qiu (NAOC), Jing Wang(GXU/NAOC), Zhenwei Li
(CHO)，and Jianyan Wei (NAOC) on behalf of SVOM GRB team

We observed the field of the fast X-ray transient WXT trigger 01709018832
from the Einstein Probe (Jiang et al. GCNC 37090) starting at 14:46 UT,
August 7, 2024, ~8.4 hr after the trigger with C-GFT (Chinese Ground
Follow-up Telescope in SVOM mission) in System Test Mode (STM). C-GFT is
located at Jilin (long.=126.33 deg, lat.= 43.8243778 deg), Changchun
Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28
deg x 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of
1.2-meter-aperure telescope.

A series of g,r,and i band images were obtained during 18 min observation.
The exposure time was 30*10 seconds for each band. Preliminary analysis
shows that the brightness of the flare star (Gaia DR3 2445442335531658752)
 were g=17.6, r=17.1 and i=15.5, without any variation.  Comparing with the
magnitude (g=18.3, r=17.1, i=15.4 ) from Pan-STARRS(PS1), the r and i band
magnitudes are consistent with PS1 catalog, but it was still brightening of
0.6 magnitude at g band. Combined with the results reported by Weikang et
al. (GCN 37095
Not found
 
 
), we  confirm that the flare star  was still at the flaring
status after ~8.4 hr from the trigger with g band observations.

We thank the observation assistants Wenbo Li and Chunlei Guo at Jilin
observatory for their excellent support.