TITLE:   GCN CIRCULAR
NUMBER:  45344
SUBJECT: GRB260809A/EPF_J234751.2+210212: EP-FXT follow-up observation
DATE:    26/08/10 12:12:39 GMT
FROM:    EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

X. X. Sun(NAO, CAS), Q. J. Huang (PMO, CAS), K. J. Zhang(YNU), J. P. Chen (SYSU), Z. X. Ling(NAO, CAS) on behalf of the Einstein Probe (EP) team:
 
EP-FXT performed a follow-up observation of GRB 260809A detected by SVOM/ECLAIRs (Brunet et al., GCN 45331). The observation started at 2026-08-09 17:30:29 (UTC), about 2.55 hr after the SVOM trigger, with a total exposure time of around 3 ks.
 
On-ground analysis of the FXT data found a source EPF_J234751.2+210212 at R.A. = 356.9632,  deg and Dec. = 21.0368 deg (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The source position is consistent with the optical counterpart (Li et al., GCN 45336; Adami et al., GCN 45338; Rajabov et al., GCN 45339; Izzo et al., GCN 45340; Basa et al. 45342). The observed flux is approximately 4.5 × 10^-12 erg s^-1 cm^-2 in the 0.5-10 keV energy band.
 
Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).