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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 3E3AB14EB0; Thu, 14 Aug 2025 09:17:12 +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]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.planetcloud-host.com (Postfix) with ESMTPS id 309D514477 for <stefano@bicar.it>; Thu, 14 Aug 2025 09:17:09 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (8.14.7/8.14.7) with ESMTP id 57E7H79o028249 for <stefano@bicar.it>; Thu, 14 Aug 2025 03:17:08 -0400 Date: Thu, 14 Aug 2025 03:17:07 -0400 Message-Id: <202508140717.57E7H79o028249@server.astronomerstelegram.org> To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17330, 17331, 17332 ------------------------------------------------------------------------------ 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 #17330 ATEL #17330 Title: EP/FXT follow-up observation confirms the new outburst of GX 339-4 Author: Qing-Chang Zhao (IHEP), Zihan Yang (IHEP), Liang Zhang (IHEP), Lian Tao (IHEP), Hua Feng (IHEP), Shuang-Nan Zhang (IHEP) Queries: zhaoqc@ihep.ac.cn Posted: 13 Aug 2025; 08:41 UT Subjects:X-ray, Binary, Black Hole, Transient Following the XB-NEWS report on the detection of the optical rise of GX 339-4 (ATel #17327), we performed a follow-up observation with the EP/FXT instrument. This observation started at 2025-08-12T08:51:54.9 (UTC) and lasted approximately 5600 seconds. GX 339-4 was significantly detected during this observation. The X-ray spectrum can be well described by an absorbed power-law model with a photon index of 1.7(1). The absorption-corrected flux in the 0.5-10 keV band is 2.9(1)*10^-11 ergs cm^-2 s^-1. No significant quasi-periodic oscillations (QPOs) were detected in the timing analysis. We encourage continued multi-wavelength follow-up observations. We thank the Einstein Probe Science Operations team for promptly scheduling this observation. Launched on January 9, 2024, the Einstein Probe (EP) is a space-based X-ray observatory designed to monitor the soft X-ray sky and perform rapid X-ray follow-up observations (Yuan et al. 2025, Science objectives of the Einstein Probe mission). References: Yuan, W., Dai, L., Feng, H., et al. 2025, SCPMA, 68, 239501 ------------------------------------------------------------------------------ Password Certification: Liang Zhang (liang.zhang@mail.bnu.edu.cn) https://www.astronomerstelegram.org/?read=17330 ============================================================================== ATEL #17331 ATEL #17331 Title: Another glitch in the Crab pulsar (PSR B0531+21) following the July 2025 event Author: Benjamin Shaw (University of Manchester), Danai Antonopoulou (UoM), Michael J. Keith (UoM), Andrew G. Lyne (UoM), Mitchell B. Mickaliger (UoM), Benjamin W. Stappers (UoM), Patrick Weltevrede (UoM) Queries: benjamin.shaw@manchester.ac.uk Posted: 13 Aug 2025; 12:22 UT Subjects:Radio, Neutron Star, Pulsar We report the detection of a glitch in the Crab pulsar (PSR B0531+21), just 20 days after the previous event reported in ATel #17298. The new event occurred on 2025 August 6, representing the shortest inter-glitch interval ever observed in this source. The Crab pulsar is monitored daily as part of the Jodrell Bank Pulsar Timing Programme. Observations are conducted using the 42-ft telescope at 610 MHz (4 MHz bandwidth) for approximately 11 hours per day, with shorter observations using the Lovell Telescope at 1532 MHz (384 MHz bandwidth). Preliminary timing analysis indicates a fractional increase in spin frequency of dF0/F0 = 4.53(17)E-09 and a fractional increase in the spin-down rate of dF1/F1 = 0.44(7)E-03 (1-sigma uncertainties). The glitch epoch is currently estimated as MJD 60893.9(7). No post-glitch recovery has yet been identified, but daily monitoring is ongoing. ------------------------------------------------------------------------------ Password Certification: Benjamin Shaw (benjamin.shaw@manchester.ac.uk) https://www.astronomerstelegram.org/?read=17331 ============================================================================== ATEL #17332 ATEL #17332 Title: OAUNI photometry of SN 2025qpk Author: A. Pereyra (Geophysical Institute of Peru, Astronomy Area), M. Zevallos (National University of Engineering - UNI, Peru), J. Tello (UNI), D. Alvarado (UNI), J. Delgado (UNI) Queries: apereyra@igp.gob.pe Posted: 13 Aug 2025; 20:15 UT Subjects:Optical, Supernovae, Transient We report photometry of Type Ia SN 2025qpk (TNSTR-2025-2620, TNSCR-2025-2624) gathered with the OAUNI 51cm telescope (arXiv:1512.03104) at Huancayo Observatory, Peru. CCD imaging in R filter was performed on two consecutive nights under non-photometric conditions with airmasses lower than 1.3. The integration time was 60x20s=1200s for all observations. Our measurements yielded: <table style="font-size: 100%" > <tr> <td>Date (UT)</td> <td>filter</td> <td>seeing (")</td> <td>mag</td> </tr> <tr> <td>2025-07-24.333</td> <td>R</td> <td>1.8</td> <td>14.56 +/- 0.01</td> </tr> <tr> <td>2025-07-25.138</td> <td>R</td> <td>2.3</td> <td>14.49 +/- 0.01</td> </tr> </table> UCAC4 field stars were used for the zero point calibration. Our observations are ~17 days after the discovery (TNSTR-2025-2620). The OAUNI project is supported by UNI, TWAS, IGP and ProCiencia-Concytec (Convenio 133-2020 Fondecyt). ------------------------------------------------------------------------------ Password Certification: Antonio Pereyra (apereyra@igp.gob.pe) https://www.astronomerstelegram.org/?read=17332 ============================================================================== ============================================================================== This is an automatically-generated notice. 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