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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17833, 17834
Message-Id: <20260606070523.1394828807A5@server.astronomerstelegram.org>
Date: Sat,  6 Jun 2026 03:05:23 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17833							     ATEL #17833

Title:	EP-FXT follow-up of the X-ray transient EP260531a
Author:	G. L. Huang, Z. X. Li, J. Y. Cao (IHEP, CAS), J. W. Hu, Y.
		Liu (NAO, CAS) on behalf of the Einstein Probe (EP) team
Queries:	ep_ta@bao.ac.cn
Posted:	5 Jun 2026; 08:37 UT
Subjects:X-ray, Transient

The Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission
performed a follow-up observation of the X-ray transient EP260531a (ATel
#17828) on 2026-06-04 07:33:43 (UTC), with a net exposure of 6 ks. A bright
X-ray source was detected within the WXT error circle at R.A. = 265.7118
and Dec. = -31.20025 (J2000). The source position has an uncertainty radius
of 10 arcseconds (90% confidence level, including both statistical and
systematic uncertainties).

The FXT spectrum can be fitted with an absorbed power-law plus blackbody
model. The best-fitting parameters are a hydrogen column density of 5.4
(+0.4/-0.5)e22 cm-2, a photon index of 4.8 (+0.4/-0.5), and a blackbody
temperature of 0.44 (+/-0.03) keV. The observed 0.5-10.0 keV flux is 1.84
(+/-0.04)e-10 erg/s/cm^2.

Additionally, we note that this source keeps brightening in the WXT monitoring,
with the 0.5-4.0 keV observed flux rising from approximately 7.4 (+0.4/-0.2)e-11
erg/s/cm^2 at 2026-05-31 07:45:29 to about 2.3 (+0.6/-0.5)e-10 erg/s/cm^2
at 2026-06-04 18:58:37 (UTC).

Further follow-up observations are encouraged to identify the nature of
this source.

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).

EP260531a: Einstein Probe detection of an X-ray transient: https://www.astronomerstelegram.org/?read=17828
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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17833
==============================================================================
ATEL #17834							     ATEL #17834

Title:	Correction to Galactic coordinates of EP260531a
Author:	G. L. Huang, Z. X. Li, J. Y. Cao (IHEP, CAS), J. W. Hu, Y.
		Liu (NAO, CAS) on behalf of the Einstein Probe (EP) team
Queries:	ep_ta@bao.ac.cn
Posted:	6 Jun 2026; 03:08 UT
Subjects:X-ray, A Comment

In ATel #17828, the Galactic coordinates of the X-ray transient EP260531a
were given incorrectly due to a coordinate conversion error.

The correct Galactic coordinates are l = 357.773 deg and b = -0.689 deg.

This correction does not affect any of the observational results or conclusions
presented in the original ATel. We apologize for the error.

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).

EP260531a: Einstein Probe detection of an X-ray transient: https://www.astronomerstelegram.org/?read=17828
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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17834
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