TITLE: GCN CIRCULAR NUMBER: 38171 SUBJECT: EP241107a: EP-FXT follow-up observations DATE: 24/11/12 05:08:32 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
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).
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