TITLE:   GCN CIRCULAR
NUMBER:  43307
SUBJECT: GRB 260102A: EP-FXT follow-up observation
DATE:    26/01/02 15:50:27 GMT
FROM:    EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

Y.-H. I. Yin (HKU), X. Mao (NAO, CAS), J. P. Chen (SYSU), and H. W. Pan (NAO, CAS) on behalf of the Einstein Probe (EP) team:

EP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260102A (SVOM/sb26010201, Xie et al., GCN 43295) at 2026-01-02 05:43:47 (UTC), about 1.5 hours after the SVOM/ECLAIRs trigger, with an exposure time of 3523 s. One uncatalogued source is detected within the ECLAIRs error circle, and the source is spatially consistent with the counterpart reported in optical and X-ray bands, including detections (Evans et al., GCN 43298; Wu et al., GCN 43300; Bernardini et al., GCN 43304) and upper limits (Antier et al., GCN 43303; Saccardi et al., GCN 43305). Preliminary analysis on this source is automatically conducted, and details are listed as follows.

EPF_J121547.6+481500
RA (J2000): 183.9483
Dec (J2000): 48.2501
Flux: 3.82 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 4.60 x 10^-14 erg/s/cm2 (1 sigma)

The position uncertainty of the source is about 10 arcsec in radius (90% C.L. statistical and systematic).

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).