GCN Circular 45304
Subject
EP260806a: SVOM/VT optical observation
Event
Date
2026-08-07T09:39:44Z (4 days ago)
From
Yinuo Ma <mayn@bao.ac.cn>
Via
Web form
Y. N. Ma, H. L. Li, Y. L. Qiu, C. Wu, L. P. Xin, Z. H. Yao, J. R. Xu, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, 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 EP260806a detected by EP/WXT (Li et al., GCN 45299). SVOM/VT began observing the field at 2026-08-06T23:46:08 UTC, 43.667 minutes after the trigger, in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously.
With X-band data available, no uncatalogued sources are found within the EP/FXT error circle (Li et al., GCN 45299). At the optical counterpart position reported by LCO (He et al., GCN 45300; de Ugarte Postigo et al., GCN 45302; Eyles-Ferris et al., GCN 45303), a bright cataloged galaxy is detected. Preliminary photometric analysis shows a brightening of ~0.1 mag from 0.728 h to 3.855 h in both bands.
Further detailed analysis is still ongoing.
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.