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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17243, 17244
Message-Id: <20250625071058.1E52328808C1@server.astronomerstelegram.org>
Date: Wed, 25 Jun 2025 03:10:58 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17243							     ATEL #17243

Title:	XRISM/Xtend Transient Search (XTS) detected an X-ray brightening
		from XRISM J1235-3957
Author:	M. Yoshimoto, C. Kang (Ehime U.), K. Fukushima, Y. Kanemaru,
		S. Ogawa (JAXA), M. Audard (U. de Geneve), E. Behar (Technion), T.
		Hakamata (Osaka U.), S. Inoue (Kyoto U.), Y. Ishihara (Chuo U.), T.
		Kiyomoto (Saitama U.), T. Kohmura (TUS), H. Kuramoto (Osaka U.), J.
		Kurashima (U. of Miyazaki), Y. Maeda (JAXA), H. Matsumoto (Osaka U.),
		T. Matsushima (U. of Miyazaki), A. Miyamoto (Osaka U.), M. Mizumoto
		(UTEF), K. Mori (U. of Miyazaki), Y. Motogami (Saitama U.), N. Nagashima
		(Chuo U.), T. Narita (Kyoto U.), M. Nobukawa (NUE), H. Noda (Tohoku
		U.), Y. Sakamoto (Tohoku U.), M. Shidatsu (Ehime U.), H. Sugai (Chuo
		U.), H. Takahashi (Hiroshima U.), T. Takagi (Ehime U.), S. Takatuska
		(Osaka U.), R. Takemoto (U. of Miyazaki), Y. Terada (Saitama U.),
		Y. Terashima (Ehime U.), Y. Tsuboi (Chuo U.), H. Uchida (Kyoto U.),
		T. Yoneyama (Chuo U.)
Queries:	kanemaru.yoshiaki@jaxa.jp
Posted:	24 Jun 2025; 14:29 UT
Subjects:X-ray, Transient

XRISM/Xtend Transient Search (XTS) detected an X-ray brightening from an
X-ray source XRISM J1235-3957 on 2025-6-22 TT. The source position is determined
to be (R.A., Dec.) = (188.722, -39.947), with a systematic error of &sim;
40 arcsec. There is no plausible X-ray counterpart to XRISM J1235-3957
within a 2 arcmin radius. All statistical uncertainties in this report
are provided as a 90% confidence level unless stated otherwise.

The brightening lasted only about four minutes from 2025-6-22 at &sim;
22:27 to 2025-6-22 at &sim; 22:31 TT. In the brightening, the flux is calculated
as (2 &plusmn; 1) &times; 10-12 erg s-1 cm-2
(0.4 &ndash; 10.0 keV), using an absorbed power-law model. A systematic
error of roughly 20% should be added to the statistical error.

We derived the above systematic error for the flux by comparing our derived
values for the sources detected with XTS in several observations with those
for the corresponding X-ray counterparts. We estimated the systematic error
for the source position from the separations between the detected sources
with the corresponding counterparts in the same field of view.

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Password Certification: Yoshiaki Kanemaru (kanemaru.yoshiaki@jaxa.jp)
https://www.astronomerstelegram.org/?read=17243
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ATEL #17244							     ATEL #17244

Title:	Fermi-LAT detection of renewed gamma-ray activity from the
		BL Lac PMN J1315-5334
Author:	Pietro Monti-Guarnieri (University of Trieste and INFN Trieste),
		Richard J. Britto (University of the Free State),  on behalf of the
		Fermi Large Area Telescope Collaboration
Queries:	dr.richard.britto@gmail.com
Posted:	24 Jun 2025; 22:01 UT
Subjects:Gamma Ray, >GeV, Request for Observations, AGN, Blazar

The Large Area Telescope (LAT), one of the two instruments on the Fermi
Gamma-ray Space Telescope, has observed renewed gamma-ray activity from
a source positionally consistent with the BL Lac PMN J1315-5334, also known
as 4FGL J1315.1-5333 (The Fermi-LAT collaboration 2020, ApJS, 247, 33),
with coordinates R.A. = 198.76742 deg, Dec. = -53.57663 deg (J2000; Xu
et al. 2019, ApJS, 242, 5), and unknown redshift.

Preliminary analysis indicates that this source was in an elevated gamma-ray
emission state on June 23, 2025, with a daily averaged gamma-ray flux (E>100MeV)
of (1.1+/- 0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only).
This corresponds to a flux increase of a factor of about 30 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). This flux is
about 2.5 times the one observed on April 23, 2025 (ATEL #17162) and similar
to the flux observed on September 18, 2021 (ATEL #14929). However, the
corresponding photon index is 2.04 +/- 0.13, indicating a significantly
harder spectrum than reported during previous outbursts or in 4FGL-DR4,
where the long-term average spectrum has an index of 2.43+/-0.03. We observed
two photons with energies >10 GeV associated with the source with p > 0.999
and p>0.994, with energies of 16 and 17.5 GeV, respectively.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray
monitoring of this source will continue. Preliminary Fermi-LAT light curves
for PMN J1315-5334 can be accessed via the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PMN_J1315-5334">Monitored
Source List</a>, and via the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/lcr/source.html?source_name=4FGL_J1315.1-5333">Fermi-LAT
Light-Curve Repository</a>. We encourage multifrequency observations of
this source. For this source, the Fermi-LAT contact person is Isabella
Mereu (mereuisabella@gmail.com).

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: Richard Britto (dr.richard.britto@gmail.com)
https://www.astronomerstelegram.org/?read=17244
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