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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17858
Message-Id: <20260630070319.EAD952880791@server.astronomerstelegram.org>
Date: Tue, 30 Jun 2026 03:03:19 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17858							     ATEL #17858

Title:	MAXI/GSC detection of the onset of an X-ray outburst from the
		Be/X-ray binary pulsar 4U 0115+63
Author:	M. Uenishi (Ehime U.), M. Serino (AGU), M. Nakajima, H. Negoro,
		K. Saito, T. Yokoyama, M. Wada (Nihon U.), T. Mihara, T. Tamagawa,
		N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, Y. Kawakubo,
		H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, Y. Ishihara, H. Ogaki (Chuo
		U.), M. Shidatsu, C. Kang, T. Usuki, S. Yatsuzuka, H. Aoe (Ehime U.),
		I. Takahashi, Y. Yatsu (Science Tokyo), S. Nakahira, S. Ueno, H. Tomida,
		M. Kurihara (JAXA), Y. Ueda, K. Fujiwara, S. Kobayashi (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), S. Ogawa (TUS)
Queries:	nakajima.motoki@nihon-u.ac.jp
Posted:	29 Jun 2026; 10:03 UT
Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar

The MAXI/GSC nova alert system triggered on an X-ray brightening from the
Be/X-ray binary pulsar 4U 0115+63 on 2026 June 29 (MJD 61220).  The previous
X-ray outburst from this source was observed on April 2024 (ATel #16573).
The latest X-ray flux in 4-10 keV band, averaged over 4 scan transits
between 20:48 UT on June 28 (MJD 61219) and 01:27 UT on June 29 (MJD 61220),
was 47 &plusmn; 9 mCrab.  The trigger date corresponds to an orbital phase
of &sim;0.06, calculated using the orbital ephemeris of P<sub>orb</sub>=24.3174
d and T<sub>0</sub>=53243.038(MJD) (Raichur & Paul 2010).  At this stage,
it is unclear whether this outburst will develop into a giant one.  Multi-wavelength
follow-up observations are encouraged to monitor the evolution of this
outburst.

The latest X-ray light curves can be monitored at the following pages;

MAXI ( https://maxi.riken.jp/v7l3h/J0118+637/index.html ), and

Fermi/GBM ( https://gammaray.msfc.nasa.gov/gbm/science/pulsars/lightcurves/4u0115.html
).

the MAXI alert information: https://maxi.riken.jp/alert/novae/1220024025/1220024025.htm
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Password Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
https://www.astronomerstelegram.org/?read=17858
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