GCN Circular 43731

C. Wu (NAOC), Z. Kang (CHO), L.P. Xin, X.H. Han, P.P. Zhang, X.M. Lu (NAOC), Z.W. Li, Y. Lv (CHO), R.S. Zhang, Y.J. Xiao, Y.L. Qiu, J. Wang, J.S. Deng, L. Huang, J.Y. Wei (NAOC) report on behalf of the SVOM/C-GFT team:

We observed the field of EP260213a (ID:01709258378) detected by EP/WXT (Yang et al., GCN 43729

) with LATIOS on SVOM/C-GFT. Observations started at 2026-02-13T19:58:40 UTC, ~6.78 min after the trigger.

We obtained g, r, and i-band follow-up imaging. After preliminary analysis，no credible candidate was detected within the error box provided by EP/FXT (Li et al., GCN 43730

) in our images. The 3-sigma upper limits are:

Mid_t - T0 (min)	Exposure Time (s)	Band	Upper Limit (AB)
10.76	6×30	g	19.9
13.75	11×30	i	19.8
15.28	6×30	r	19.9

The photometry was calibrated against Pan-STARRS1 stars and no correction for Galactic dust extinction was applied.

Our result is consistent with GCN 43728

(Cotter et al.)

We thank the observation assistants Hong-Xu Xue and Bo-Wen Li at Jilin observatory for their excellent support.

The Chinese Ground Follow-up Telescope (C-GFT) for the SVOM mission is located at Jilin Station, Changchun Observatory, National Astronomical Observatories, CAS. It features two instruments: (1) CATCH at the Cassegrain focus with a 21 arcsec x 21 arcsec FOV for simultaneous g/r/i-band imaging, and (2) LATIOS, a 4k x 4k CMOS camera at the prime focus with a 1.28 deg x 1.28 deg FOV that images in g, r, and i bands via filter switching.