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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17624, 17625
Message-Id: <20260124071209.0400F2880349@server.astronomerstelegram.org>
Date: Sat, 24 Jan 2026 02:12:09 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17624							     ATEL #17624

Title:	Fermi-LAT detection of enhanced gamma-ray activity from the
		FSRQ PKS 1725+123
Author:	S. Rani (Michigan Technological University), T. Lewis (Michigan
		Technological University), G. La Mura (INAF - Astronomical Observatory
		of Cagliari), P. Monti-Guarnieri (University of Trieste and INFN Trieste)
		on behalf of the Fermi Large Area Telescope Collaboration
Queries:	rani@mtu.edu
Posted:	23 Jan 2026; 20:45 UT
Subjects:Gamma Ray, >GeV, Request for Observations, Blazar, Quasar

The Large Area Telescope (LAT), one of the two instruments on the Fermi
Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from
a source positionally consistent with the flat-spectrum radio quasar PKS
1725+123, also known as 4FGL J1728.0+1216 (Abdollahi et al. 2022, ApJS,
260, 53), with coordinates R.A. = 262.02938 deg, Dec. = +12.26097 deg (J2000;
Xu et al. 2019, ApJS, 242, 5), and redshift z = 0.586 (Shaw et al. 2013,
ApJ, 764, 135).

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on January 22, 2026, with a daily averaged gamma-ray flux
(E>100MeV) of (1.1+/-0.2) e-6 photons cm^-2 s^-1 (statistical uncertainty
only). This corresponds to a flux increase of a factor of more than 60
relative to the average flux reported in the fourth data release of the
fourth Fermi-LAT catalog (4FGL-DR4, Ballet et al. 2023, arXiv:2307.12546).
The corresponding photon index is 1.8+/-0.1, indicating a significantly
harder spectrum than the 4FGL-DR4 value of 2.47+/-0.05. Two high-energy
photons with energies of 12 GeV and 15 GeV are associated with the source
with probabilities p > 0.99. The Fermi-LAT Collaboration has previously
reported flaring activity from this source in ATels #17370, #17094 and
#17316.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. We encourage multifrequency observations
of this source. A preliminary light curve for PKS 1725+123 is available
via the Fermi-LAT Light-Curve Repository at <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1728.0+1216">4FGL
J1728.0+1216</a>. For this source, the Fermi-LAT contact person is Pietro
Monti-Guarnieri (pietro.monti-guarnieri@phd.units.it).

The Fermi-LAT is a pair conversion telescope designed to cover the energy
band from 20 MeV to greater than 300 GeV. It is the product of an international
collaboration between NASA and DOE in the U.S. and many scientific institutions
across France, Italy, Japan and Sweden.

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Password Certification: Giovanni La Mura (giovanni.lamura@inaf.it)
https://www.astronomerstelegram.org/?read=17624
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ATEL #17625							     ATEL #17625

Title:	XRISM follow-up observation of the black hole X-ray binary
		GS 1354-64
Author:	H. Liu (U. Tuebingen), T. Yoneyama, K. Fukushima, Y. Kanemaru,
		S. Ogawa, Y. Uchida (ISAS/JAXA), C. Baluta (NASA/GSFC), Y. Terada
		(Satama U.), E. Costantini (SRON), M. Guainazzi (ESA/ESTEC), R. Kelley
		(NASA/GSFC), K. Matsushita (TUS), R. Petre, B. Williams (NASA/GSFC),
		H. Yamaguchi, S. Watanabe (JAXA/ISAS), M. Tashiro (Saitama U.)
Queries:	tyoneyama263@g.chuo-u.ac.jp
Posted:	24 Jan 2026; 03:07 UT
Subjects:X-ray, Black Hole, Transient

MAXI/GSC found a new outburst of the black hole X-ray binary GS 1354-64
on 2025-12-25 (ATel #17563). Since then, multi-wavelength follow-up observations
have been carried out (ATel #17582, #17583, #17586, #17611, #17612, #17618).

X-Ray Imaging and Spectroscopy Mission (XRISM) observed GS 1354-64 as a
DDT target of opportunity. The observation started at 2026-01-20T03:37:00
and completed at 2026-01-23T04:00:00 (TT). The quick-look data of Resolve
obtained from a slice of the observation, 2026-01-20T07:29:22 to 2026-01-21T05:36:09,
yielded the X-ray flux of 5.3 &times; 10-9 erg s-1cm-2
(2.0 &ndash; 13.0 keV). The preliminary source position is obtained to
be (R.A., Dec.) = (209.542, -64.734) from the Xtend data in the same duration.

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Password Certification: Tomokage Yoneyama (tyoneyama263@g.chuo-u.ac.jp)
https://www.astronomerstelegram.org/?read=17625
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