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From: atel@astronomerstelegram.org
Subject: ATel 17328
Message-Id: <20250812070612.F40E42880829@server.astronomerstelegram.org>
Date: Tue, 12 Aug 2025 03:06:12 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17328							     ATEL #17328

Title:	MAXI/GSC detection of an X-ray flare from HR1099 on 2025-08-11
		UT
Author:	H. Negoro, M. Nakajima, K. Takagi, H. Takahashi, 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, A. Yoshida (AGU),  Y. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara
		(Chuo U.),  M. Shidatsu, Y. Niida, C. Kang, T. Nakamoto (Ehime U.),
		I. Takahashi, Y. Yatsu (Science Tokyo),  S. Nakahira, S. Ueno, H.
		Tomida, M. Ishikawa, S. Ogawa, M. Kurihara (JAXA),  Y. Ueda, 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:	12 Aug 2025; 02:16 UT
Subjects:X-ray, Binary, Star, Transient, Variables

At 10:38 on 2025-08-11 UT, the MAXI/GSC nova alert system triggered on
a source at a position consistent with that of the RS CVn star HR1099.

The position of the X-ray enhancement is determined to be (R.A., Dec) =
(54.233 deg, 0.370 deg) = (03 36 55, +00 22 11) (J2000) with a statistical
90% C.L. elliptical error region 
with long and short radii of 0.41 deg and 0.32 deg, respectively, for the
data at the scan transit from 10:34 on 2025-08-11 UT to 10:39 on 2025-08-11
UT. The roll angle of long axis from the north direction is 76.0 deg counterclockwise.
There is an additional systematic uncertainty of 0.1 deg (90% containment
radius). This position is consistent with that of HR1099.

The flux at the transit is 2 &times; 10-9 erg s-1
cm-2 (2-10 keV). Corresponding luminosity is 2 &times; 1032
erg s-1 for an assumed distance of 30 pc.

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