文件操作 - 1756969584.M444444P1959.mail.planetcloud-host.com,S=5377,W=5467:2,
返回文件管理
返回主菜单
删除本文件
文件: /var/vmail/bicar.it/stefano/cur/1756969584.M444444P1959.mail.planetcloud-host.com,S=5377,W=5467:2,
编辑文件内容
Return-Path: <atel@astronomerstelegram.org> Delivered-To: stefano@bicar.it Received: by mail.planetcloud-host.com (Postfix, from userid 1016) id 60BA314BE1; Thu, 4 Sep 2025 09:06:24 +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 31EC014BBA for <stefano@bicar.it>; Thu, 4 Sep 2025 09:06:21 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id A600F28807B7 for <stefano@bicar.it>; Thu, 4 Sep 2025 03:06:20 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17370 Message-Id: <20250904070620.A600F28807B7@server.astronomerstelegram.org> Date: Thu, 4 Sep 2025 03:06:20 -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 #17370 ATEL #17370 Title: ATel Draft: Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ PKS 1725+123 Author: P. van Zyl (South African Radio Astronomy Observatory), G. La Mura (INAF - Astronomical Observatory of Cagliari), and F. Longo (University of Trieste and INFN Trieste) on behalf of the Fermi Large Area Telescope Collaboration Queries: pvanzyl@sarao.ac.za Posted: 3 Sep 2025; 16:38 UT Subjects:Gamma Ray, >GeV, AGN The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed renewed gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 1725+123, also known as 4FGL J1728.0+1216 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates R.A. = 262.02938 deg, Dec. = +12.26097 deg (J2000; Xu et al. 2019, ApJS, 242, 5), and redshift z = 0.586 (Shaw et al. 2013, ApJ, 764, 135). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on September 2, 2025, with a daily averaged gamma-ray flux (E > 100 MeV) of (1.1 +/- 0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of more than 60 relative to the average flux reported in the fourth release of the Fourth Fermi-LAT catalog (4FGL-DR4, Ballet et al. 2024, arXiv:2307.12546). This is the highest LAT daily flux ever observed for this source. The corresponding photon index of 2.1 +/- 0.2 indicates a significantly harder spectrum than the 4FGL-DR4 value of 2.47 +/- 0.05 (Ballet et al. 2023, arXiv:2307.12546). The Fermi-LAT Collaboration has previously reported flaring activity from this source in ATels #17094 and #17316. Recent flaring activity was also reported in optical (ATel #17345), radio (ATel #17356) and VHE regimes (ATels #17344, #17346). The redshift of z=0.568 reported in the previous ATels was due to a transcription error in Nanci et al. (2022, A&A, 663, 129, table 3). Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. A preliminary light curve for PKS 1725+123 is available at the <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1728.0+1216">Fermi-LAT Light-Curve Repository</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Pietro Monti-Guarnieri (pietro.monti-guarnieri@phd.units.it). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. ------------------------------------------------------------------------------ Password Certification: Pfesesani van Zyl (pfesi24@gmail.com) https://www.astronomerstelegram.org/?read=17370 ============================================================================== ============================================================================== 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
修改文件时间
将文件时间修改为当前时间的前一年
删除文件