TITLE:   GCN CIRCULAR
NUMBER:  45632
SUBJECT: GRB 260918A: EP-FXT follow-up observation
DATE:    26/09/18 13:55:36 GMT
FROM:    EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

Z.-C. Zou (NJU), B. Zhang, J. P. Feng (USTC), G. Y. Zhao (QTNU), W. D. Zhang (NAO,CAS) on behalf of the Einstein Probe (EP) team:

EP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260918A (SVOM/sb26091801; Zhao et al., GCN 45619) starting at 2026-09-18T05:52:20 UTC, approximately 2 hours after the SVOM trigger, with a total exposure time of 3004 s. Four 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_J233857.5-085504
RA (J2000): 354.7406
Dec (J2000): -8.9179
Flux: 1.3736 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.7412 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J233915.3-084941
RA (J2000): 354.8139
Dec (J2000): -8.8279
Flux: 7.3429 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.0415 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J233943.4-085235
RA (J2000): 354.9304
Dec (J2000): -8.8773
Flux: 4.3974 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 6.4445 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J233833.8-090039
RA (J2000): 354.6402
Dec (J2000): -9.0102
Flux: 1.533 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 3.6492 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).