GCN Circular 45078

Subject

GRB 260704A: EP-FXT follow-up observation

Event

GRB 260704A

Date

2026-07-04T14:56:07Z (5 days ago)

From

EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

Via

Web form

Y.-H. I. Yin, C.-K. Kan (HKU), Y. H. Cheng (YNU), S.Y. Fu (HUST). Z. X. Ling (NAO, CAS) on behalf of the Einstein Probe (EP) team:

EP-FXT performed an automatically follow-up observation of GRB 260704A detected by SVOM/ECLAIRs (Xie et al., GCN 45072Loading...
 
 ). The follow-up observation started at 2026-07-04T04:49:23 (UTC), about 1 hr after the SVOM trigger, with a total exposure time of around 2.6 ks.

On-ground analysis of the FXT data found an uncatalogued source within the ECLAIRs and MXT error circles at R.A., Dec. = 318.7151, -25.5074 deg (J2000) with an uncertainty of about 10 arcsec (radius, 90% C.L. statistical and systematic). The derived average unabsorbed flux is 1.49 (-0.22/+0.26) x 10^(-12) erg/s/cm^2 (0.5-10 keV; 1-sigma uncertainty).

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).