GCN Circular 45870
EP261007b: SVOM/VT optical detection of the NOT transient
From: Huali Li at at NAOC, SVOM
Issued: 2026-10-09 02:31 UTC
Type: X-ray Transient, Optical Transient

H. L. Li, Y. N. Ma, Y. L. Qiu, C. Wu, L. P. Xin, Z. H. Yao, J. R. Xu, L. J. Chen, 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.

Following the report from NOT observations (Quirola-Vasquez et al., GCN 45864), we reexamined the SVOM/VT images of EP261007b (Ma et al., GCN 45849). The optical transient reported therein was also detected in our stacked images.

The measurements below are in AB magnitudes and are not corrected for Galactic extinction:

Mid time | Band | Exposure Time | Brightness
1.24 hr | VT_B | 26*50 s | 21.9+/-0.2 mag
1.24 hr | VT_R | 26*50 s | 21.6+/-0.2 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.

Filter: only the top 10% of the past year's X-ray transients are posted, ranked by the number of GCN Circulars written about them (now ≥ 11). Thresholds are recalculated monthly. Only events first reported within the past 7 days can start a thread.
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