TITLE: GCN CIRCULAR NUMBER: 43900 SUBJECT: GRB 260228A: EP-FXT follow-up observation DATE: 26/03/03 07:00:27 GMT FROM: EP Team at NAOC/CAS <ep_ta@bao.ac.cn> Y.H.Cheng, D.Zhu, K.J.Zhang (SWIFAR, YNU), H.C.Ding, T.Wu (AHNU), C.C.Jin (NAOC) on behalf of the Einstein Probe (EP) team: EP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260228A (SVOM/sb26022802; Julakanti et al., GCN 43882) starting at 2026-02-28T22:50:15 UTC, approximately 5 minutes after the SVOM trigger, with a total exposure time of 5527 s. Six uncataloged sources are detected within the ECLAIRs error circle. Preliminary analysis on these sources is automatically conducted, and the details are listed as follows. EPF_J155124.0+262035 RA (J2000): 237.8501 Dec (J2000): 26.3431 Flux: 2.1373 x 10^-12 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 1.6673 x 10^-13 erg/s/cm2 (1 sigma) EPF_J155105.1+261820 RA (J2000): 237.7711 Dec (J2000): 26.3055 Flux: 9.6351 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 1.891 x 10^-14 erg/s/cm2 (1 sigma) EPF_J155123.9+261238 RA (J2000): 237.8498 Dec (J2000): 26.2105 Flux: 7.077 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 1.6973 x 10^-14 erg/s/cm2 (1 sigma) EPF_J155130.8+261248 RA (J2000): 237.8781 Dec (J2000): 26.2134 Flux: 1.231 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 2.1478 x 10^-14 erg/s/cm2 (1 sigma) EPF_J155140.7+261349 RA (J2000): 237.9195 Dec (J2000): 26.2303 Flux: 1.5723 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 3.1532 x 10^-14 erg/s/cm2 (1 sigma) EPF_J155148.8+262150 RA (J2000): 237.9533 Dec (J2000): 26.3640 Flux: 1.0194 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV) Flux_err: 2.9166 x 10^-14 erg/s/cm2 (1 sigma) 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/43900. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...