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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17650, 17651
Message-Id: <20260208071134.D0F2E28808AD@server.astronomerstelegram.org>
Date: Sun,  8 Feb 2026 02:11:34 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17650							     ATEL #17650

Title:	Einstein Probe detection of the brightening of the black hole
		X-ray binary GS 1354-64/BW Cir
Author:	J. W. Hu, X. Mao (NAO, CAS), Y. L. Hua (PMO, CAS), H. Sun
		(NAO, CAS) on behalf of the Einstein Probe team
Queries:	ep_ta@bao.ac.cn
Posted:	7 Feb 2026; 07:10 UT
Subjects:X-ray, Binary, Black Hole

We report on the detection of the brightening of black hole X-ray binary
GS 1354-64/BW Cir by the Wide-field X-ray Telescope (WXT) on board the
Einstein Probe (EP) mission. Multiwavelength detections of GS 1354-64/BW
Cir have been reported since December 25, 2025 (ATel #17563, #17582, #17583,
#17586, #17611, #17612, #17618, #17625, #17638), indicating the renewed
activity of the source and a transition from the hard to the soft state.
The last WXT coverage of this source in August 2025 resulted in a non-detection.
Due to the Sun-angle constraint, it has only become visible to WXT since
February 4, 2026. The source was detected by WXT in a 360 s exposure observation
at 2026-02-04T09:29:24 (UTC). The WXT spectrum can be fitted by an absorbed
power law with a photon index of 2.2(+/-0.3) and an absorption column density
of NH=9.6(+1.6, -1.5) e+21 cm^-2. The derived unabsorbed flux in 0.5-4
keV is 1.1(+0.3, -0.2) x 10^-8 ergs/s/cm^2, consistent with the Swift observation
on 28 January 2026 (ATel #17638).

The source has now re-entered the EP-WXT visible window and will be continuously
monitored in the survey mode in the coming period.

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). EP is a mission of the Chinese Academy
of Sciences in collaboration with ESA, MPE and CNES.

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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17650
==============================================================================
ATEL #17651							     ATEL #17651

Title:	LFBOT ATeL#17646: X-ray upper limit by the Follow-up X-ray
		Telescope onboard the Einstein Probe
Author:	H. Sun, J. W. Hu, X. Mao (NAO, CAS), Y. L. Hua (PMO, CAS)
		on behalf of the Einstein Probe team
Queries:	ep_ta@bao.ac.cn
Posted:	7 Feb 2026; 07:44 UT
Subjects:X-ray, Transient

We observed the field of the LFBOT candidate reported by Tsuboi et al.
(ATel #17646) and followed up by Gill et al. (ATel #17647), Pereyra et
al. (ATel #17648) and Schneider et al. (ATel #17649) using the Follow-up
X-ray Telescope onboard the Einstein Probe. The observation started at
2026-02-06T18:19:29 (UTC), with an exposure of 5.6 ks. No significant X-ray
emission was detected at the position of the LFBOT candidate. Stacking
the data of FXT-A and FXT-B modules, we derived a 90% confidence upper
limit on the 0.5-10 keV flux of 3e-14 erg/cm^2/s, assuming an absorbed
powerlaw spectrum with photon index of 2 and galactic absorption column
density of 6.6e20 cm^-2.

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Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17651
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