TITLE: GCN CIRCULAR NUMBER: 39329 SUBJECT: EP250215a: EP-WXT detection and FXT follow-up observation of an X-ray transient DATE: 25/02/15 04:26:05 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
C. Y. Wang(THU), A. Li (BNU), D. H. Zhao, Z. X. Ling (NAOC, CAS) report on behalf of the Einstein Probe 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 EP250215a (trigger ID: 01709131576). The WXT position of the source is R.A. = 156.3430 deg, DEC = -27.7040 deg (J2000) with an uncertainty of 2.9 arcmin in radius (90% C.L. statistical and systematic). The transient triggered EP-WXT at 2025-02-15T02:32:03 (UTC). The trigger time and the position are generally consistent with the likely long GRB 250215A (GCN #39327).
A follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error cirlce, an uncatalogued X-ray source was detected at R.A. = 156.3301 deg, DEC = -27.6997 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic).
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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