GCN Circular 38171

R.-Z. Li (YNAO, CAS), W. Chen (NAO, CAS), K. Chatterjee, X. L. Chen (YNU), H. Zhou (PMO, CAS), T. Zhao and H. W. Pan (NAO, CAS) report on behalf of the Einstein Probe team:

We report the EP-FXT follow-up observations of the X-ray transient, EP241107a, which triggered the on-board EP-WXT processing unit at 2024-11-07T14:10:23Z (UTC) (Zhou et al., GCN 38112

). The refined peak flux is estimated to be approximately 4.2E-9 erg/s/cm^2 in 0.5-4 keV. There are three follow-up observations of EP241107a, detecting a fading, previously uncataloged X-ray source.

The results are reported:

T_start (UTC)	T_end (UTC)	Exposure (s)	T_mid - T_0 (h)	Flux (0.5-10keV, erg/s/cm^2)
2024-11-07T14:12:16	2024-11-07T16:09:18	4321	1.0	~ 1.47E-11
2024-11-08T00:54:51	2024-11-08T03:22:18	4007	12.0	~ 4.35E-13
2024-11-11T10:37:41	2024-11-11T14:40:47	9104	94.5	< 2.23E-14

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).