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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 1016) id 85CCE14ED8; Fri, 31 Jul 2026 09:03:21 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.planetcloud-host.com X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=disabled version=3.4.0 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 Received: from server.astronomerstelegram.org (astronomerstelegram.org [174.142.199.243]) by mail.planetcloud-host.com (Postfix) with ESMTP id D7C8C14BBF for <stefano@bicar.it>; Fri, 31 Jul 2026 09:03:19 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 8471D28807E4 for <stefano@bicar.it>; Fri, 31 Jul 2026 03:03:18 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17931 Message-Id: <20260731070318.8471D28807E4@server.astronomerstelegram.org> Date: Fri, 31 Jul 2026 03:03:18 -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 #17931 ATEL #17931 Title: MAXI/GSC detection of a recurrent X-ray outburst from the Be/X-ray binary pulsar LS V +44 17 (RX J0440.9+4431) Author: T. Usuki (Ehime. Univ.), M. Nakajima, H. Negoro, K. Saito, T. Yokoyama, M. Wada (Nihon U.), T. Mihara, 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, 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: 30 Jul 2026; 10:00 UT Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar The MAXI/GSC nova alert system triggered on an X-ray brightening from a position consistent with the Be/X-ray binary pulsar LS V +44 17 (RX J0440.9+4431) on 2026 July 30 (MJD 61251). Prior to this trigger, the source region had been outside the MAXI/GSC FOV since July 1 (MJD 61222), thus the exact onset of the current outburst remains uncertain. Preliminary analysis reveals that the latest 4-10 keV flux, averaged over 4 scans between 23:06 UT on July 29 (MJD 61250) and 03:45 UT on July 30 (MJD 61251), reached 119 ± 17 mCrab. Compared to the peak flux of the previous activity in 2026 May (∼50 mCrab; ATel #17816), the flux has already doubled. Multi-wavelength follow-up observations are encouraged to monitor whether this event develops into a major outburst. The latest X-ray light-curve can be checked at the following pages; MAXI ( https://maxi.riken.jp/v7l3h/J0440+445/index.html ) and Fermi/GBM ( https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/rxj0440.html ). the MAXI alert information: http://maxi.riken.jp/alert/novae/1251125330/1251125330.htm ------------------------------------------------------------------------------ Password Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp) https://www.astronomerstelegram.org/?read=17931 ============================================================================== ============================================================================== 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
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