GCN Circular 45400
Subject
GRB260818A: EP-FXT follow-up observation
Event
Date
2026-08-19T03:49:35Z (3 days ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
Z.M. Wang(BNU), C.Y. Dai(NJU), D. F. Hu(PMO,CAS) and H.W. Pan(NAOC) on behalf of the Einstein Probe (EP) team:
EP-FXT performed a follow-up observation of GRB 260818A detected by SVOM/ECLAIRs (Yin et al., GCN 45391). The observation started at 2026-08-18 02:43:32(UTC), about 1.67 hr after the SVOM trigger, with a total exposure time of around 4.6 ks.
On-ground analysis of the FXT data found several uncataloged sources inside the ECLAIRs error region.
Name | RA | DEC | Sep_obj (arcmin) | Flux (erg/cm^2/s)
EPF_J232025.8-320549 | 350.1077 | -32.0971 | 6.101382 | 1.3205e-13
EPF_J231936.3-320537 | 349.9012 | -32.0935 | 6.582593 | 5.9746e-14
EPF_J231953.3-320838 | 349.9729 | -32.1449 | 6.812141 | 2.0801e-13
EPF_J231912.9-320034 | 349.8036 | -32.0095 | 10.701601 | 1.0260e-12
EPF_J231953.3-320838 | 349.9722 | -32.1440 | 6.770902 | 2.0112e-13
EPF_J232037.7-320633 | 350.1572 | -32.1093 | 8.604395 | 4.5878e-14
with uncertainties of 10 arcsec (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).