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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 81D10146FD; Tue, 14 Apr 2026 09:04:02 +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 7DF6A146CE for <stefano@bicar.it>; Tue, 14 Apr 2026 09:03:15 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 79E242880807 for <stefano@bicar.it>; Tue, 14 Apr 2026 03:03:14 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17752 Message-Id: <20260414070314.79E242880807@server.astronomerstelegram.org> Date: Tue, 14 Apr 2026 03:03:14 -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 #17752 ATEL #17752 Title: Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ NRAO 512 Author: Janeth Valverde (Marquette University), Giovanni La Mura (INAF - Astronomical Observatory of Cagliari), on behalf of the Fermi Large Area Telescope Collaboration Queries: valverde@llr.in2p3.fr Posted: 13 Apr 2026; 21:37 UT Subjects:Gamma Ray, >GeV, AGN, Blazar The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar NRAO 512, also known as 4FGL J1640.4+3945 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates R.A. = 250.12347 deg, Dec. = +39.77945 deg (J2000; Xu et al. 2019, ApJS, 242, 1), and redshift z=1.672 (Albareti et al. 2017, ApJS, 233, 2). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state from April 11 to 12, 2026 , with an averaged gamma-ray flux (E>100MeV) of (0.5+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 10 relative to the average flux reported in the fourth data release of the fourth Fermi-LAT catalog (4FGL-DR4, Ballet et al. 2023, arXiv:2307.12546). This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 2.1+/-0.2, slightly harder than the 4FGL-DR4 value of 2.44+/-0.04. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. A preliminary light curve for NRAO 512 can be accessed via the Fermi-LAT Light-Curve Repository at <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/lcr/source.html?source_name=4FGL_J1640.4+3945">4FGL J1640.4+3945</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Janeth Valverde (janeth.phd@gmail.com). 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: Janeth Valverde (valverde@llr.in2p3.fr) https://www.astronomerstelegram.org/?read=17752 ============================================================================== ============================================================================== 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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