TITLE:   GCN CIRCULAR
NUMBER:  46212
SUBJECT: GRB 261108C: EP/FXT follow-up observation
DATE:    26/11/10 06:42:32 GMT
FROM:    EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

G. L. Huang, J. Y. Cao (IHEP, CAS), Y. Q. Zhao (PRIC, USTC), H. Sun (NAO, CAS) on behalf of the Einstein Probe (EP) team:

EP/FXT conducted a follow-up observation of GRB 261108C at 2026-11-08 22:10:33 UTC, approximately 51 min 23 sec after the T0 determined by SVOM/ECLAIR (Hamburg et al., GCN 46198), with an exposure time of approximately 4400s.

A new X-ray source was detected within the MXT error circle (Hamburg et al., GCN 46198), at R.A. = 11.7271 deg, Dec. = -64.3027 deg, with a 90% C.L. radius of 10 arcseconds. Fitting the spectrum with a simple absorbed power-law model, with nH fixed at 2.02 x 10^20 cm^-2, yields a photon index of 2.8 (-1.0/+1.1). The unabsorbed flux in the 0.5-10 keV band is 7.3 (-2.2/+4.0) x 10^-14 erg/cm2/s.

Launched on January 9, 2024, EP is a space X-ray observatory designed to monitor the soft X-ray sky and provide X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).