TITLE:   GCN CIRCULAR
NUMBER:  41836
SUBJECT: SVOM/sb25091517:  Confirmation of a stellar flare by SVOM/VT
DATE:    25/09/16 07:10:53 GMT
FROM:    Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>

H.L. Li (NAOC), L.P. Xin, Y. N. Ma,  Y.L. Qiu, C. Wu, Z.H. Yao, X.H. Han, J. Wang, W.J. Xie, Y. Xu, H.B. Cai, J.Y. Wei (NAOC), J. Palmerio (CEA), Y. Julakanti, R. A. J. Eyles-Ferris (U. Leicester) report on behalf of the SVOM team.

SVOM performed an automatic slew on the soft burst triggered by SVOM/ECLAIRs (Julakanti et al., GCN 41834) in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. The observation with good image quality began at 2025-09-15T22:09:18, i.e., 457 sec post trigger. 
 
With X band downlinked data, preliminary analysis shows that the M2 dwarf 1RXS J020013.6-084106 located within MXT's errorbox (Julakanti et al., GCN 41834) was decreasing in brightness from 10.6 mag to 12.2 mag in VT_B during 3 hour time interval after the trigger time. This result confirms that the trigger was due to a stellar flare, as already reported by Jelinek et al. (GCN 41617). Our photometry was estimated in AB magnitude. 

The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS.