GCN Circular 43746
Subject
EP260214a: SVOM/VT optical upper limits
Event
Date
2026-02-15T06:31:32Z (a day ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, Y. N. Ma, L. P. Xin, Y. L. Qiu, C. Wu, Z. H. Yao, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA) report on behalf of the SVOM/VT team.
SVOM/VT performed a Target of Opportunity observation of EP260214a detected by Einstein Probe (Li et al., GCN 43742). The observation started on 2026-02-14T23:12:55 UTC, 2.58 hours after the trigger, in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously.
No uncatalogued sources were detected in stacked images within the error box of EP-FXT (Li et al., GCN 43742). The 3 sigma limit magnitudes are derived as follows:
Mid time | Band | Exposure Time | 3 sigma limit magnitude
3.60 hours VT_B 56*50 sec > 23.6 mag
3.60 hours VT_R 50*50 sec > 23.3 mag
Our photometry was in AB magnitude and was not corrected for Galactic extinction.
The nondetection is consistent with the result from MASTER (Lipunov et al., GCN 43743).
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.