文件操作 - 1781766205.M109260P4445.mail.planetcloud-host.com,S=5312,W=5403:2,

文件: /var/vmail/bicar.it/stefano/cur/1781766205.M109260P4445.mail.planetcloud-host.com,S=5312,W=5403:2,

编辑文件内容

Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it 
To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17847
Message-Id: <20260618070321.20BAE2880810@server.astronomerstelegram.org>
Date: Thu, 18 Jun 2026 03:03:21 -0400 (EDT)

------------------------------------------------------------------------------ 
The Astronomer's Telegram is free to read, free to publish, free to
use.  Thanks to the support of our patrons, we can continue to
keep it free. https://www.patreon.com/astronomerstel
------------------------------------------------------------------------------ 
The Astronomer's Telegram                   http://www.astronomerstelegram.org 
------------------------------------------------------------------------------
Posted: Within the last 24 hours
==============================================================================
ATEL #17847							     ATEL #17847

Title:	MAXI/GSC detection of an X-ray brightening from the Be/X-ray
		binary pulsar XTE J1946+274
Author:	M. Nakajima, H. Negoro (Nihon U.), W. Iwakiri (Chiba U.),
		T. Mihara (RIKEN), K. Saito, T. Yokoyama, M. Wada (Nihon U.), T. Tamagawa,
		N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita,
		Y. Kawakubo, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, Y. Ishihara,
		H. Ogaki (Chuo U.), M. Shidatsu, C. Kang, M. Uenishi, 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.), T. Kawamuro
		(Osaka U.), S. Yamada (Tohoku U), S. Ogawa (TUS)
Queries:	nakajima.motoki@nihon-u.ac.jp
Posted:	17 Jun 2026; 08:37 UT
Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar

The MAXI/GSC nova alert system triggered on a weak X-ray brightening from
the position consistent with the Be/X-ray binary pulsar XTE J1946+274 on
2026 June 16 (MJD 61207).  The last X-ray outburst from this source was
observed in 2024 by MAXI/GSC (ATel #16717), SVOM/ECLAIRs (ATel #16719),
EP-WXT (ATel #16723), and NICER (ATel #16744).  In addition, the optical
follow-up observations of this outburst were performed by KAIT (ATel #16720)
and SVOM/C-GFT (ATel #16722) and no obvious brightness changes were reported.

Our preliminary analysis revealed that the 4-10 keV flux averaged over
four scans between 05:23 UT and 13:07 UT on 2026 June 16 was 0.0568 &plusmn;
0.0140 photons s-1 cm-2 (45 &plusmn; 11 mCrab). 
Using the orbital ephemeris (Porb = 172.7 &plusmn; 0.6 d, Tperi
= 55514.8+0.8-1.1 MJD ; Marcu-Cheatham et al. 2015),
we confirmed that the trigger date corresponds to an orbital phase of &sim;0.96.
Since the 12-50 keV pulsed flux observed by Fermi/GBM has been significantly
detected since 2026 June 10 (MJD 61201), the precise onset phase of this
outburst is estimated to be &sim;0.93. Compared with the previous outburst
in 2024, the current outburst has already reached 1.3 times of the previous
peak flux.

Follow-up observations are encouraged to investigate whether the source
will again exhibits a series of outbursts similar to those observed in
2010 (e.g. Marcu-Cheatham et al. 2015).

The latest X-ray light-curve can be checked at the following pages;

MAXI ( https://maxi.riken.jp/pubdata/v7.7l/J1945+273/index.html ) and

Fermi/GBM ( https://gammaray.msfc.nasa.gov/gbm/science/pulsars/lightcurves/xtej1946.html
).

the MAXI alert information: https://maxi.riken.jp/alert/novae/1207473980/1207473980.htm
------------------------------------------------------------------------------
Password Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
https://www.astronomerstelegram.org/?read=17847
==============================================================================

==============================================================================
This is an automatically-generated notice.  You can remove yourself permanently
from receiving both the Daily Email Digest and Instant Email Notices from
The Astronomer's Telegram by following this link:
https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it

文件操作 - 1781766205.M109260P4445.mail.planetcloud-host.com,S=5312,W=5403:2,

文件: /var/vmail/bicar.it/stefano/cur/1781766205.M109260P4445.mail.planetcloud-host.com,S=5312,W=5403:2,

编辑文件内容

修改文件时间

删除文件