GCN Circular 45269
Subject
GRB 260727A: EP-FXT further follow-up observations and candidate afterglow
Event
Date
2026-08-02T07:33:20Z (22 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
Ziming Wang (BNU), Ruizhi Li (YNAO), An Li (BNU), Yifang Liang (PMO), Wenjin Xie (NAOC), Donghua Zhao (NAOC), Clara Plasse (HKU) report on behalf of the SVOM mission team:
EP-FXT performed a second epoch of follow-up observation of GRB 260727A (Li et al., GCN 45220; Harsha K. H. et al., GCN 45225; Cheung et al., GCN 45233; Svinkin et al., GCN 45242; Wang et al. GCN 45247). The follow-up observation started at 2026-07-30 00:38:00 (UTC), about 72.3 hours after the SVOM-ECLAIRs trigger, with a total exposure time of around 2.5 ks.
A faint X-ray source was detected at the position of the uncatalogued X-ray source (Li et al., GCN 45236). The 0.5-10 keV spectrum can be fitted by an absorbed powerlaw model with a Galactic hydrogen column density of 0.55 x 10^22 cm^-2 and a photon index of 2.09 +1.07/-1.29. The average unabsorbed flux is 1.58 (+2.52, -0.93) x 10^(-13) erg/s/cm^2 in the 0.5-10 keV energy band (90% C.L.).
The Burst Advocate (BA) on shift for this alert is Ziming Wang: 202421101144@mail.bnu.edu.cn.
Please contact the BA by email if you require additional information.