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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 0ACA614ECA; Wed, 23 Jul 2025 09:06:51 +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 2EDB014518 for <stefano@bicar.it>; Wed, 23 Jul 2025 09:06:48 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 8213228807B6 for <stefano@bicar.it>; Wed, 23 Jul 2025 03:06:47 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17299 Message-Id: <20250723070647.8213228807B6@server.astronomerstelegram.org> Date: Wed, 23 Jul 2025 03:06:47 -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 #17299 ATEL #17299 Title: Fermi-LAT detection of a new gamma-ray source associated with the Radio Source TXS 1727+488 Author: C. Bartolini (University of Trento & INFN Bari), G. La Mura (INAF - Astronomical Observatory of Cagliari), P. Monti-Guarnieri (University of Trieste & INFN Trieste), on behalf of the Fermi Large Area Telescope Collaboration Queries: chiara.bartolini-1@unitn.it Posted: 22 Jul 2025; 17:49 UT Subjects:Gamma Ray, >GeV, AGN, Blazar, Quasar The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed gamma-ray emission from a source with coordinates R.A. = 262.25 deg, Dec. = +49.01 deg and 95% confidence uncertainty radius of 0.23 deg. This source is not in any published LAT catalog and was not detected by AGILE or EGRET. The localization uncertainty region includes the radio source TXS 1727+488, with coordinates R.A. = 262.27006 deg, Dec. = 48.79791 deg (Helfand et al. 2015, ApJ, 801, 26) and unknown redshift. Preliminary analysis indicates that this source was significantly detected (>5 sigma) in a high gamma-ray state on July 19, 2025, with a daily averaged gamma-ray flux (E>100MeV) of (0.5+/-0.1) X 10^-6 photons cm^-2 s^-1 and a single power-law photon index of 2.2+/-0.2 (statistical uncertainties only). Further analysis of the time range covering from July 18, 2025 at 00:00 UT to July 20, 2025 at 23:59 improved the gamma-ray localization, resulting in a detection at R.A. = 262.37 deg, Dec. = 48.96 deg and 95% uncertainty radius of 0.17 deg, strengthening the case for the association with TXS 1727+488. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Chiara Bartolini (Chiara.Bartolini@ba.infn.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: Chiara Bartolini (chiara.bartolini-1@unitn.it) https://www.astronomerstelegram.org/?read=17299 ============================================================================== ============================================================================== 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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