TITLE: GCN CIRCULAR NUMBER: 38026 SUBJECT: EP241030a: EP/FXT observation of GRB 241030A X-ray Afterglow DATE: 24/11/01 08:12:07 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
Y. F. Liang (PMO, CAS), S. Q. Jiang (NAO, CAS), D. F. Hu (PMO, CAS), H. Z. Wu (HUST), B. T. Wang (YNAO, CAS), C. C. Jin, Q. Y. Wu, H. N. Yang, Z. X. Ling (NAO, CAS) report on behalf of the Einstein Probe team:
We performed a follow-up observation of the X-ray transient detected by EP-WXT, EP241030a (Wu et al., GCN 37997), 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 21 hours later. An uncatalogued X-ray source was detected at R.A. = 343.1426 deg, DEC = 80.4498 deg (J2000) with an uncertainty of about 10 arcsecs (radius, 90% C.L. statistical and systematic), consistent with the position of the WXT transient within the uncertainties. The averaged EP-FXT spectrum can be fitted with an absorbed power-law (NH fixed at the Galactic value 1.8 x 10^21 cm^-2), with a photon index of 2.2 (+/- 0.2). The derived average unabsorbed flux is 1.5 (+0.2/-0.1) x 10^-12 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).
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