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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 6CDD414C2C; Sun, 7 Sep 2025 09:06:27 +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, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_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 7009D146EF for <stefano@bicar.it>; Sun, 7 Sep 2025 09:06:23 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 063C72880701 for <stefano@bicar.it>; Sun, 7 Sep 2025 03:06:23 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17374 Message-Id: <20250907070623.063C72880701@server.astronomerstelegram.org> Date: Sun, 7 Sep 2025 03:06:23 -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 #17374 ATEL #17374 Title: XRISM/Xtend Transient Search (XTS) detected an X-ray flare from XRISM J1045-5941 Author: Y. Sakamoto, H. Noda (Tohoku U.), K. Fukushima, Y. Kanemaru, S. Ogawa, Y. Uchida, T. Yoneyama (JAXA), M. Audard (U. de Geneve), E. Behar (Technion), T. Hakamata (UOsaka), S. Inoue (Kyoto U.), Y. Ishihara (Chuo U.), C. Kang (Ehime U.), T. Kiyomoto (Saitama U.), T. Kohmura (TUS), H. Kuramoto (UOsaka), J. Kurashima (U. of Miyazaki), Y. Maeda (JAXA), H. Matsumoto (UOsaka), T. Matsushima (U. of Miyazaki), A. Miyamoto (UOsaka), M. Mizumoto (UTEF), K. Mori (U. of Miyazaki), Y. Motogami (Saitama U.), N. Nagashima (Chuo U.), T. Narita (Kyoto U.), M. Nobukawa (NUE), M. Shidatsu (Ehime U.), H. Sugai (Chuo U.), H. Takahashi (Hiroshima U.), T. Takagi (Ehime U.), S. Takatuska (UOsaka), R. Takemoto (U. of Miyazaki), Y. Terada (Saitama U.), Y. Terashima (Ehime U.), Y. Tsuboi (Chuo U.), H. Uchida (Kyoto U.), M. Yoshimoto (Ehime U.) Queries: tyoneyama263@g.chuo-u.ac.jp Posted: 6 Sep 2025; 14:25 UT Subjects:X-ray, Star, Transient XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J1045-5941 on 2025-09-04 TT. The source position is determined to be (R.A., Dec.) = (161.422, -59.806), with a systematic error of ∼ 40 arcsec. A plausible counterpart is 4XMM J104541.1-594824. 4XMM J104541.1-594824 is located ∼ 4 arcsec apart from the position of XRISM J1045-5941. All statistical uncertainties in this report are provided as a 90% confidence level unless stated otherwise. The flare started at 2025-09-04 at ∼ 06:45 TT. The flare reached its peak on 2025-09-04 at ∼ 08:38. The flare exponentially decayed in1.3 (+8.6/-0.6) × 10<sup>4</sup> sec. The peak flux is calculated as 3.8 (+1.0/-0.8) × 10<sup>-13</sup> erg s<sup>-1</sup> cm<sup>-2</sup> (0.4 – 10.0 keV). A systematic error of roughly 20% should be added to the statistical error. We derived the above systematic error for the flux by comparing our derived values for the sources detected with XTS in several observations with those for the corresponding X-ray counterparts. We estimated the systematic error for the source position from the separations between the detected sources with the corresponding counterparts in the same field of view. ------------------------------------------------------------------------------ Password Certification: Tomokage Yoneyama (tyoneyama263@g.chuo-u.ac.jp) https://www.astronomerstelegram.org/?read=17374 ============================================================================== ============================================================================== 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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