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From: atel@astronomerstelegram.org
Subject: ATel 17364, 17365
Message-Id: <20250830071042.86D2D28808DC@server.astronomerstelegram.org>
Date: Sat, 30 Aug 2025 03:10:42 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17364							     ATEL #17364

Title:	XRISM/Xtend Transient Search (XTS) detected an X-ray flare
		from XRISM J1046-5939
Author:	M. Mizumoto (UTEF), T. Hakamata (UOsaka), K. Fukushima, Y.
		Kanemaru, S. Ogawa, Y. Uchida, T. Yoneyama (JAXA), M. Audard (U. de
		Geneve), E. Behar (Technion),  S. Inoue (Kyoto U.), Y. Ishihara (Chuo
		U.), C. Kang (Ehime U.), T. Kiyomoto (Saitama U.), T. Kohmura (TUS),
		H. Kuramoto (UOsaka), J. Kurashima (U. of Miyazaki), Y. Maeda (JAXA),
		H. Matsumoto (UOsaka), T. Matsushima (U. of Miyazaki), A. Miyamoto
		(UOsaka), 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
		(UOsaka), R. Takemoto (U. of Miyazaki), Y. Terada (Saitama U.), Y.
		Terashima (Ehime U.), Y. Tsuboi (Chuo U.), H. Uchida (Kyoto U.), M.
		Yoshimoto (Ehime U.)
Queries:	shidatsu.megumi.wr@ehime-u.ac.jp
Posted:	29 Aug 2025; 15:52 UT
Subjects:X-ray, Star, Transient, Young Stellar Object

XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray
source XRISM J1046-5939 on 2025-08-27 TT. The source position is determined
to be (R.A., Dec.) = (161.535,-59.651), with a systematic error of &sim;
40 arcsec. A plausible counterpart is 2MASS J10460982-5938267 (YSO), which
is located &sim; 38.5 arcsec apart from the position of XRISM J1046-5939,
or 2MASS J10460999-5939103 (Long-Period Variable Candidate), which is located
&sim; 13.6 arcsec apart. The nearest X-ray source is 4XMM J104611.0-593905
and CXOGSG J104607.3-593905, which is located &sim; 14arcsec apart. All
statistical uncertainties in this report are provided as a 90% confidence
level unless stated otherwise.

The flare started at 2025-08-27 at &sim; 09:45 TT. The flare reached its
peak on 2025-08-27 at &sim; 10:55 TT. The flare exponentially decayed in
&sim;5000 sec.

The peak flux is calculated as 1 &times; 10-12 erg s-1
cm-2 (0.4 &ndash; 10.0 keV). 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: Megumi Shidatsu (shidatsu.megumi.wr@ehime-u.ac.jp)
https://www.astronomerstelegram.org/?read=17364
==============================================================================
ATEL #17365							     ATEL #17365

Title:	Spectroscopic Classification of Astrophysical Transients with
		the Lick Shane Telescope
Author:	R. Kaur, R. J. Foley, K. W. Davis (UCSC)
Queries:	ravkaur@ucsc.edu
Posted:	29 Aug 2025; 23:00 UT
Subjects:Supernovae

We report the classifications of astrophysical transients from spectroscopic
observations with the Kast spectrograph on the Shane telescope obtained
on 2025 August 29 UT. The targets were supplied by ZTF and ATLAS. Targets
were identified using the target management platform YSE-PZ (Coulter et
al., 2023, PASP, 135, 4501). The classifications were performed with SNID
(Blondin & Tonry, 2007, ApJ, 666, 1024).

ZTF25abijzcu | AT2025txy  | 01:28:28.50  | -13:34:03.86 |  0.10 |   Ia
| +10 d | (1) 
ATLAS25jol	 | AT2025uax  | 16:30:22.78  | +53:44:00.96 | 0.075 |   Ia 
|  -6 d | (2)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum. Otherwise, the redshift is determined from the host galaxy.

(1) We measure a Si II 6355 absorption velocity of -14,000 km/s. 
(2) We measure a Si II 6355 absorption velocity of -10,600 km/s.

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Password Certification: Ryan Foley (foley@ucsc.edu)
https://www.astronomerstelegram.org/?read=17365
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