GCN Circular 42986
Subject
GRB 251203C: EP-FXT follow-up observation
Event
Date
2025-12-04T14:02:16Z (3 days ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
H.Z. Wu (HUST), Y. Wu (NJU), H. Y. Ren, Tian-Yu Liu, G. J. Yang, 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 251203C (SVOM/sb25120305, Brunet et al., GCN #42976) at 2025-12-03 20:12:47 (UTC), about 52 minutes after the SVOM/ECLAIRs trigger, with an exposure time of 4569 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_J032718.1-071802
RA (J2000): 51.8268
Dec (J2000): -7.3024
Flux: 9.24 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.78 x 10^-14 erg/s/cm2 (1 sigma)
EPF_J032703.9-072334
RA (J2000): 51.7662
Dec (J2000): -7.3929
Flux: 1.07 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 3.23 x 10^-14 erg/s/cm2 (1 sigma)
EPF_J032718.1-071802
RA (J2000): 51.8255
Dec (J2000): -7.3005
Flux: 5.85 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.12 x 10^-14 erg/s/cm2 (1 sigma)
EPF_J032658.4-072128
RA (J2000): 51.7434
Dec (J2000): -7.3577
Flux: 1.12 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.77x 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).