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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 BE82314ECC; Tue, 29 Jul 2025 09:06:06 +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=7.0 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 1B6DD14ECA for <stefano@bicar.it>; Tue, 29 Jul 2025 09:06:04 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 723682880671 for <stefano@bicar.it>; Tue, 29 Jul 2025 03:06:03 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17312 Message-Id: <20250729070603.723682880671@server.astronomerstelegram.org> Date: Tue, 29 Jul 2025 03:06:03 -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 #17312 ATEL #17312 Title: CXOU J164710.2-455216: Swift/XRT flux enhancement following the detection of a burst Author: Alice Borghese (ESA/ESAC), Matteo Imbrogno, Francesco Coti Zelati, Nanda Rea (ICE-CSIC, IEEC), Paolo Esposito (IUSS Pavia), Gian Luca Israel (INAF-OAR), on behalf of a larger collaboration Queries: alice.borghese@gmail.com Posted: 28 Jul 2025; 11:01 UT Subjects:X-ray, Neutron Star, Soft Gamma-ray Repeater, Magnetar On 2025 July 26 at 22:49:05 UT, Swift/BAT detected a new short burst from a direction consistent with the magnetar CXOU J164710.2-455216, hosted in the massive star cluster Westerlund 1 (GCN #41172, ATel #17311). This is the first reported flaring activity since the multi-outburst events accompanied by bursts reported in 2017 May, 2017 October and 2018 February (e.g., GCN #21095; GCN #22389; Atel #10877; Atel #11270; Borghese et al., MNRAS, 484, 2931, 2019). An observation of our Swift monitoring program was performed with the XRT in PC mode on July 27, 2025, starting at 00:16:58 UT and ending at 23:46:53 UT, resulting in an on-source exposure time of about 4 ks. We modeled the spectrum with an absorbed blackbody, assuming a hydrogen column density of 2.5e22 cm^-2 (Borghese et al. 2019). The best fitting values are: blackbody temperature of 0.75(4) keV (errors are reported at 1 sigma confidence level) and radius of 0.52(6) km at a distance of 3.9 kpc (Kothes & Dougherty, A&A, 468, 993, 2007). The absorbed flux in the 0.3-10 keV energy band is 3.8(3)e-12 erg/cm^2/s. Moreover, we detected the spin pulsations at a period P = 10.61064(9) s, with a pulsed fraction (defined as the semi-amplitude of the best-fitting sinusoid divided by the source average count rate) PF = 47(8)%. We compared these results with those obtained from the previous observation of the monitoring campaign, carried out on May 30, 2025 (ID: 00015870032). The 0.3-10 keV absorbed flux was 1.0(2)e-12 erg/cm^2/s. Therefore, after the detection of the burst, the persistent X-ray flux has increased by a factor ~3.5. We are currently monitoring the source to assess whether the burst with the corresponding flux enhancement has marked the beginning of a new outburst. ------------------------------------------------------------------------------ Password Certification: Alice Borghese (alice.borghese@gmail.com) https://www.astronomerstelegram.org/?read=17312 ============================================================================== ============================================================================== 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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