TITLE: GCN CIRCULAR NUMBER: 43526 SUBJECT: EP260126a: EP-FXT follow-up observation DATE: 26/01/27 13:40:40 GMT FROM: EP Team at NAOC/CAS <ep_ta@bao.ac.cn> S.Y. Fu (HUST), Z.M. Wang (BNU), J.H. Wu (GZHU), H.Y. Liu, H.W. Pan (NAOC, CAS) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation of EP260126a (detected by EP-WXT, GCN 43520) about 19.1 hours after the WXT detection, with an exposure time of 5.8 ks. The FXT telemetry data show that an uncatalogued source was detected within the WXT error circle at R.A. = 103.7551, DEC = 37.7053 (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The FXT X-ray spectrum of this uncatalogued source can be fitted with an absorbed powerlaw with a hydrogen column density fixed at the Galactic value of 1.21 x 10^21 cm^-2 and a photon index of 1.76 (+/- 0.20). The derived unabsorbed 0.5-10 keV flux is approximately 5.65 (+1.0/-0.85) x 10^-13 erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. Multi-band follow-up observations are encouraged. 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). View this GCN Circular online at https://gcn.nasa.gov/circulars/43526. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...