TITLE: GCN CIRCULAR NUMBER: 38960 SUBJECT: GRB 250114B: SVOM/VT upper limit DATE: 25/01/16 07:48:38 GMT FROM: Liping Xin at NAOC, SVOM xlp@nao.cas.cn
SVOM/VT commissioning team: Y. L. Qiu, H. L. Li, L. P. Xin, C. Wu, X. H. Han, J. Wang, W. J. Xie, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, J. S. Deng, L. Lan, X. M. Lu, R. S. Zhang, Z. H. Yao, Y. N. Ma (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM), Diego Götz, Bertrand Cordier (CEA)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV)
report on behalf of the SVOM team:
The SVOM/VT conducted a ToO observations of the INTEGRAL-detected GRB 250114B (Gotz et al., GCN 38938) . The observations were carried out in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channel simultaneously.
The afterglow reported (Williams et al., GCN 38949; Sasada et al., GCN 38950) was not detected either in VT_B or VT_R stacked images.
The 3 sigma limits in AB magnitude were derived with VT_B= 23.9 mag with exposure time of 37*100 sec and VT_R= 23.6 mag with exposure time of 35*100 sec, at the mid time of about 24.0 hours after the burst.
The non-detection is consistent with the reports (Goyal et al., GCN 38942; Schneider et al., GCN 38947; Gompertz et al., GCN 38952).
The galaxy noticed (Gompertz et al., GCN 38952) was marginal detected in VT_R stacked image.
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.
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