TITLE: GCN CIRCULAR NUMBER: 40437 SUBJECT: EP250512a: Einstein Probe detection of an X-ray transient DATE: 25/05/12 12:13:33 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
D. H. Zhao, M. J. Liu, J. W. Hu, H. W. Pan (NAO, CAS) on behalf of the Einstein Probe (EP) team:
We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP250512a. The transient triggered EP-WXT (ID: 01709175718) at 2025-05-12T11:22:08 (UTC). The WXT position of the source is R.A. = 215.216 deg, DEC = -10.092 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic).
A follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 215.2023 deg, DEC = -10.0988 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic).
Further information will be updated when the telemetry data is received.
The contact TA of EP250512a is D. H. Zhao, please contact her via the email zhaodh@bao.ac.cn if needed.
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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