GCN Circular 38040
Subject
EP241030a: Futher EP-FXT observation of the X-ray Afterglow of GRB 241030A
Date
2024-11-02T08:52:28Z (2 months ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
Y. F. Liang (PMO, CAS), S. Q. Jiang (NAO, CAS), H. Z. Wu (HUST), B. T. Wang (YNAO, CAS), D. F. Hu (PMO, CAS), H. N. Yang, C. C. Jin, H. Sun, Q. Y. Wu, Z. X. Ling (NAO, CAS) report on behalf of the Einstein Probe team:
We conducted a second follow-up observation of the X-ray transient detected by EP-WXT, EP241030a (Wu et al., GCN 37997 , Liang et al., GCN 38026), which was associated with the GRB 241030A (Fermi GBM Team, GCN 37955; Klingler et al., GCN 37956; Wang et al., GCN 37972; Ridnaia et al., GCN 37982) about 2.8 days later. The observation began at 2024-11-02T01:58:27(UTC), with an exposure time about 3.2 ks, during which the afterglow was clearly detected. The averaged EP-FXT spectrum can be fitted with an absorbed power-law (NH fixed at the Galactic value of 1.8 x 10^21 cm^-2), with a photon index of 2.3 (+/- 0.6). The derived average unabsorbed flux is 2.4 (+1.0/-0.6) x 10^(-13) erg/s/cm^2 in 0.5-10 keV. All the errors of the parameters quoted are at the 90% C.L.
EP-FXT will keep monitoring this transient in the following days.
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).