TITLE:   GCN CIRCULAR
NUMBER:  46277
SUBJECT: GRB 261114A: SVOM/VT optical observations of a  plateau after 5 ks
DATE:    26/11/14 18:30:49 GMT
FROM:    Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>

H. L. Li, C. Wu, Y. L. Qiu, Y. N. Ma, L. P. Xin, L. J. Chen, Z. H. Yao, J. R. Xu, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu), Ziqi Wang (GXU) report on behalf of the SVOM/VT team.

SVOM/VT performed continuous observations on the SVOM burst GRB 261114A (sb26111401, Li et al., GCN 46267) in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously (Li et al., GCN 46273).

The optical counterpart (Wu et al., GCN 46269; Zhao et al., GCN 46272) remains bright, with VT_R~20.4+/-0.1 mag at 3.24 hr post trigger. A plateau is seen in the light curves of both channels after 5 ks. Our measurements are in AB magnitudes and are not corrected for Galactic extinction.

Further observations are planned.

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.