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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17525
Message-Id: <20251205070611.C0A842880833@server.astronomerstelegram.org>
Date: Fri,  5 Dec 2025 02:06:11 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17525							     ATEL #17525

Title:	EP J012607.7+121047: Einstein Probe detection of an X-ray transient
		associated with the candidate CV AT2023row/Gaia23cer
Author:	W. J. Zhang (NAO, CAS), H. C. Ding, T. Wu (AHNU), Y. H. Jiang,
		Y. Wu (NJU), Y. Wang (PMO), Y. Liu (NAO, CAS), on behalf of the Einstein
		Probe (EP) team:
Queries:	ep_ta@bao.ac.cn
Posted:	4 Dec 2025; 09:00 UT
Subjects:X-ray, Cataclysmic Variable, Nova

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 EP
J012607.7+121047. The source was identified by stacking the WXT data spanning
September 2025 to November 2025. Stacking of the WXT data taken prior to
this detection indicated that the source had already emerged in August
2024. The WXT position of the source is R.A. = 21.510 deg, Dec. = 12.186
deg (J2000) with an uncertainty of 2.5 arcmin in radius (90% C.L. statistical
and systematic). The estimated 0.5-4 keV flux derived from the WXT spectrum
is ~3.5 x 10^(-12) erg/s/cm^2.

We performed a target-of-opportunity follow-up observation with the Follow-up
X-ray Telescope (FXT) at 2025-12-02T15:20:59 (UTC). Within the WXT error
circle, an uncatalogued X-ray source was detected at R.A. = 21.5321 deg,
Dec. = 12.1796 deg (J2000) with an uncertainty of 10 arcsec in radius (90%
C.L. statistical and systematic).  The FXT position is around 3 arcsec
away from the candidate CV AT2023row/Gaia23cer (Atel #16240 and #16249).
The average FXT 0.5-10 keV spectrum can be fitted with an absorbed power
law, with a fixed Galactic hydrogen column density of 3.8 x 10^20 cm^-2
and a photon index of 1.14 (-0.09/+0.09). The derived average unabsorbed
0.5-10 keV flux is 2.18 (-0.21/+0.23) x 10^(-11) erg/s/cm^2.

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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