GCN Circular 44638
Subject
EP260514a: SVOM/VT optical candidate
Event
Date
2026-05-16T06:59:29Z (14 days ago)
Edited On
2026-05-17T22:42:28Z (13 days ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, Y. L. Qiu, C. Wu, L. P. Xin, Y. N. Ma, 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, L. Lan, J. S. Deng, J. Y. Wei (NAOC) and J. Palmerio report on behalf of the SVOM/VT team.
SVOM/VT performed ToO observations to the field of EP260514a (Lipunov et al., GCN 44614; Mohan et al., GCN 44619; Sánchez et al., GCN 44632), which was triggered by Einstein Probe (EP260514a, Cheng et al., GCN 44613). The observation started at 2026-05-15T03:03:58 UTC, 10.13 hours post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously.
An uncatalogued optical source was detected within WXT's error box (Cheng et al., GCN 44613) in both channels, compared to the Legacy Survey. The position is at R.A., Dec. = 214.293637, 49.375378 degrees, equivalent to:
R.A. (J2000) = 14:17:10.47
Dec. (J2000) = +49:22:31.36
with an uncertainty of 0.5 arcsec.
The following measurements are in the AB magnitude without correction for Galactic extinction:
Mid time | Band | Exposure Time | Brightness
11.96 h VT_B 44*50 s 23.15 +/- 0.22 mag
11.97 h VT_R 39*50 s 22.03 +/- 0.14 mag
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.