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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17150, 17151
Message-Id: <20250418071109.EF9AF2880699@server.astronomerstelegram.org>
Date: Fri, 18 Apr 2025 03:11:09 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17150							     ATEL #17150

Title:	MAXI/GSC detection of an X-ray flare from II Peg on 2025-04-15
		UT
Author:	N. Nagashima, Y. Tsuboi (Chuo U.),  H. Negoro (Nihon U.),
		 M. Serino (AGU),  T. Mihara (RIKEN), M. Nakajima, K. Takagi, H. Takahashi,
		K. Tatano, H. Nishio (Nihon U.),  T. Tamagawa, N. Kawai, M. Matsuoka
		(RIKEN),  T. Sakamoto, S. Sugita, Y. Kawakubo, H. Hiramatsu, Y. Kondo,
		S. Sasao, A. Yoshida (AGU),  H. Sugai (Chuo U.),  M. Shidatsu, Y.
		Niida, C. Kang, T. Nakamoto (Ehime U.), I. Takahashi, M. Niwano, N.
		Higuchi, Y. Yatsu (Tokyo Tech),  S. Nakahira, S. Ueno, H. Tomida,
		M. Ishikawa, S. Ogawa, M. Kurihara (JAXA),  Y. Ueda, Y. K. Fujiwara
		(Kyoto U.),  M. Yamauchi, M. Nishio, C. Hiraizumi (Miyazaki U.), 
		K. Yamaoka (Nagoya U.),  M. Sugizaki (Kanazawa U.),  W. Iwakiri (Chiba
		U.),  T. Kawamuro (Osaka U.),  S. Yamada (Tohoku U),  report on behalf
		of the MAXI team:
Queries:	tsuboi@phys.chuo-u.ac.jp
Posted:	17 Apr 2025; 13:26 UT
Subjects:X-ray, Binary, Star, Transient, Variables

In the accumulated image from 2025-04-15 20:22 UT to 2025-04-16 19:25 UT,
the MAXI/GSC nova alert system triggered on a source at a position consistent
with that of an RS CVn star II Peg.

The position is determined as (R.A., Dec) = (358.526 deg, 28.340 deg) =
(23 54 06, +28 20 23) (J2000) with a statistical 90% C.L. elliptical error
region with long and short radii of 0.37 deg and 0.29 deg, respectively.
The roll angle of the long axis from the north direction is 8.0 deg counterclockwise.
There is an additional systematic uncertainty of 0.1 deg (90% containment
radius). This position is consistent with that of the RS CVn star II Peg.

The X-ray flux averaged over the accumulated span is -1 +- 2 mCrab (4.0-10.0keV,
1 sigma error), which corresponds to a luminosity of 8 &times; 1031
erg s-1 s -1 for a distance of 40 pc.

The flux increased from 2025-04-15 21h to 2025-04-16 03h UT, remained at
the top level until 2025-04-16 18h, and then decayed with an e-folding
time of 0.16 days. The total energy released during the flare is 1 &times;
10 36 erg.

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Password Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
https://www.astronomerstelegram.org/?read=17150
==============================================================================
ATEL #17151							     ATEL #17151

Title:	MAXI/GSC detected an X-ray increase on GT Mus from 2025-04-17
		UT
Author:	H. Sugai (Chuo U.), W. Iwakiri (Chiba U.), Y. Tsuboi, N. Nagashima
		(Chuo U.), H. Negoro, M. Nakajima, K. Takagi, H. Takahashi, K. Tatano,
		H. Nishio (Nihon U.),  T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka
		(RIKEN),  T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu,
		Y. Kondo, S. Sasao, A. Yoshida (AGU),  M. Shidatsu, Y. Niida, C. Kang,
		T. Nakamoto (Ehime U.), I. Takahashi, M. Niwano, N. Higuchi, Y. Yatsu
		(Tokyo Tech),  S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa,
		M. Kurihara (JAXA),  Y. Ueda, Y. K. Fujiwara (Kyoto U.),  M. Yamauchi,
		M. Nishio, C. Hiraizumi (Miyazaki U.),  K. Yamaoka (Nagoya U.), M.
		Sugizaki (Kanazawa U.),  T. Kawamuro (Osaka U.),  S. Yamada (Tohoku
		U), report on behalf of the MAXI team:
Queries:	tsuboi@phys.chuo-u.ac.jp
Posted:	17 Apr 2025; 16:09 UT
Subjects:X-ray, Binary, Star, Transient, Variables

At 03:55 on 2025-04-17 UT, the MAXI/GSC nova alert system triggered on
a source at a position consistent with that of an RS CVn star GT Mus.

The position is determined from the data at the triggered scan, as (R.A.,
Dec) = (174.889,  -65.333 deg) = (11 39 33, -65 19 58) (J2000) with a statistical
90% C.L. elliptical error region with long and short radii of 0.30 deg
and 0.1 deg, respectively. The roll angle of the long axis from the north
direction is 92.0 deg counterclockwise.There is an additional systematic
uncertainty of 0.1 deg (90% containment radius). This position is consistent
with that of an RS CVn star GT Mus.

The flux is 
4 &times; 10-10 erg s-1 cm-2 (2.0 &ndash;
20.0 keV) for the period from 00:00 on 2025-04-16 to 22:57 on 2025-04-17
UT, and the flare is still continuing. The flux corresponds to a luminosity
of 6 &times; 1031 erg s-1 s -1 for an
assumed distance of 110 pc.

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Password Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
https://www.astronomerstelegram.org/?read=17151
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