GCN 45249: GRB 260726A: EP-FXT follow-up observations

Ruizhi Li (YNAO), Ziming Wang (BNU), Yifang Liang (PMO), Wenjin Xie (NAOC), Clara Plasse (HKU) report on behalf of the SVOM mission team:

EP-FXT performed a follow-up observation of GRB 260726A detected by SVOM/ECLAIRs (Liang et al., GCN 45219), which also triggered Fermi/GBM (Scotton et al., GCN 45218, GCN 45246). The follow-up observation started at 2026-07-27T23:04:39 (UTC), about 23.32 hours after the SVOM-ECLAIRs trigger, with a total exposure time of around 5 ks. 

No X-ray counterpart was detected at the VT position (Li et al., GCN 45230). The estimated flux upper limit is 1.16 x 10^(-13) erg cm^-2 s^-1 in the 0.5–10 keV energy band (90% C.L.).

Optical follow-up observations of the burst were carried out by MASTER (Lipunov et al., GCN 45221), SVOM/VT (Li et al., GCN 45230), WINTER (Mohan et al., GCN 45232) and Liverpool Telescope (Bochenek et al., GCN 45241).

The Burst Advocate (BA) on shift for this alert is Rui-Zhi Li: liruizhi@ynao.ac.cn
Please contact the BA by email if you require additional information.