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Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 99) id 9CD8514EBA; Fri, 29 May 2026 09:03:52 +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 3827914603 for <stefano@bicar.it>; Fri, 29 May 2026 09:03:14 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 275412880863 for <stefano@bicar.it>; Fri, 29 May 2026 03:03:13 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17819 Message-Id: <20260529070313.275412880863@server.astronomerstelegram.org> Date: Fri, 29 May 2026 03:03:13 -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 #17819 ATEL #17819 Title: XRISM/Xtend Transient Search (XTS) detected an X-ray flare possibly from 2SXPS J232525.2+583935 Author: T. Narita (RIKEN), H. Uchida (Kyoto U.), Y. Kanemaru, A. Miyamoto, Y. Omiya, Y. Uchida, T. Yoneyama (JAXA), M. Audard (U. de Geneve), E. Behar (Technion), K. Fukushima (TUS), 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), Y. Maeda (JAXA), H. Matsumoto (UOsaka), A. Miyamoto (UOsaka), M. Mizumoto (UTEF), Y. Motogami (Saitama U.), M. Nobukawa (NUE), H. Noda (Tohoku U.), S. Ogawa (TUS), Y. Sakamoto (Tohoku U.), M. Shidatsu (Ehime U.), H. Takahashi (Hiroshima U.), T. Takagi (Ehime U.), S. Takatsuka (UOsaka), F. Takisawa (Ehime U.), Y. Terada (Saitama U., JAXA), Y. Terashima (Ehime U.), Y. Tsuboi (Chuo U.), A. Yoshimoto (NWU), M. Yoshimoto (Ehime U.), P. P. Plucinsky (CfA) Queries: uchida@cr.scphys.kyoto-u.ac.jp Posted: 28 May 2026; 11:23 UT Subjects:Transient XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J2325+5840 on 2026-5-26 TT. The source position is determined to be (R.A., Dec.) = (351.357, 58.660), with a systematic error of ∼ 40 arcsec. The plausible counterparts are X-ray sources 2SXPS J232525.2+583935 located ∼ 3 arcsec apart from the position of XRISM J2325+5840, respectively. All statistical uncertainties in this report are provided as a 90% confidence level unless stated otherwise. The flare started at 2026-05-26 at ∼ 19:29 TT. The flare reached its peak on 2026-05-26 at ∼ 19:29. The flare exponentially decayed in ∼ 3 × 10<sup>4</sup> sec. The peak flux is calculated as 3.1 × 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. The corresponding luminosity is 1.5 × 10<sup>31</sup> erg s<sup>-1</sup> by assuming the distance to XRISM J2325+5840 of 200 pc. 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 and their corresponding counterparts in the same field of view. ------------------------------------------------------------------------------ Password Certification: Hiroyuki Uchida (uchida@cr.scphys.kyoto-u.ac.jp) https://www.astronomerstelegram.org/?read=17819 ============================================================================== ============================================================================== 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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