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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17213, 17214
Message-Id: <20250602071154.CC19C28807F5@server.astronomerstelegram.org>
Date: Mon, 2 Jun 2025 03:11:54 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17213							     ATEL #17213

Title:	4C+10.45 optically bright
Author:	 Roberto Nesci (INAF/IAPS), Antonio Vagnozzi (MPC589)
Queries:	roberto.nesci@inaf.it
Posted:	1 Jun 2025; 08:22 UT
Subjects:Optical, Gamma Ray, AGN, Blazar

The QSO 4C+10.45 was detected in a bright Gamma-ray state on 2025-05-25
by Wagner et al.(ATel #17206). 
Optical follow-up with the 30 cm telescope of the S. Lucia di Stroncone
Observatory (MPC 589) was performed on May 25, 29, and 31 with the BVRI
Bessell filters. In the B images the source was detected but poorly measurable,
while in the other filters was well measurable and found much brigther
than the quiescent level reported in the PanSTARRS-DR1 catalog. Here are
our findings: 
2025-05-27T23:39 V=17:50, R=17.01, I=16.52; 2025-05-29T22:24 V=17:28, R=16.86,
I=16.42; 2025-05-31T01:48 V=16.74, R=16.26, I=15.64. The source appears
very active and brightening, further optical follow-up is encouraged.

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Password Certification: Roberto Nesci (roberto.nesci@inaf.it)
https://www.astronomerstelegram.org/?read=17213
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ATEL #17214							     ATEL #17214

Title:	XRISM/Xtend Transient Search (XTS) detected an X-ray flare
		from XRISM J0534-6600 in BSDL 2344 region of LMC
Author:	Y. Terada (Saitama U., JAXA), K. Fukushima, Y. Kanemaru, S.
		Ogawa (JAXA), M. Audard (U. de Geneve), E. Behar (Technion), S. Inoue
		(Kyoto U.), Y. Ishihara (Chuo U.), T. Kohmura (TUS), Y. Maeda (JAXA),
		H. Matsumoto (Osaka U.), M. Mizumoto (UTEF), K. Mori (U. of Miyazaki),
		N. Nagashima (Chuo U.), M. Nobukawa (NUE), H. Noda (Tohoku U.), K.
		Pottschmidt (UMBC, NASA GSFC, CRESST), M. Shidatsu (Ehime U.), H.
		Sugai (Chuo U.), T. Takagi (Ehime U.), H. Takahashi (Hiroshima U.),
		Y. Terashima (Ehime U.), Y. Tsuboi (Chuo U.), H. Uchida (Kyoto U.),
		T. Yoneyama (Chuo U.), M. Yoshimoto (Ehime U.),  S. Katsuda (Saitama.
		U)
Queries:	terada@mail.saitama-u.ac.jp
Posted:	1 Jun 2025; 15:06 UT
Subjects:X-ray, Transient

XRISM/Xtend Transient Search (XTS) detected an X-ray flare from BSDL 2344
region in Large Magellanic Cloud (LMC) on 2025-05-30 TT. The source position
is determined to be (R.A., Dec.) = (83.570, -66.008), with a systematic
error of &sim; 40 arcsec. Plausible counterparts are X-ray sources 4XMM
J053423.3-660024 or 1eRASS J053423.5-660030. All statistical uncertainties
in this report are provided as a 90% confidence level unless stated otherwise.

XRISM/XTS detected the flare at the peak time on 2025-05-30 at &sim; 15:56
TT, and the flare decayed in &sim; 4,000 sec.

The peak flux is calculated as 3 &times; 10-13 erg s-1
cm-2 (0.4 &ndash; 10.0 keV). A systematic error of roughly 20%
should be added to the statistical error. The corresponding luminosity
is 3 &times; 1034 erg s-1 by assuming the distance
at 50 kpc in LMC.

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: Yukikatsu Terada (terada@mail.saitama-u.ac.jp)
https://www.astronomerstelegram.org/?read=17214
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