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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 62D38146D3; Wed, 14 Jan 2026 08:08:02 +0100 (CET) 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 5D28E14502 for <stefano@bicar.it>; Wed, 14 Jan 2026 08:07:32 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 14B982880875 for <stefano@bicar.it>; Wed, 14 Jan 2026 02:07:31 -0500 (EST) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17594 Message-Id: <20260114070731.14B982880875@server.astronomerstelegram.org> Date: Wed, 14 Jan 2026 02:07:31 -0500 (EST) ------------------------------------------------------------------------------ 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 #17594 ATEL #17594 Title: An Exceptional Very-High-Energy Gamma-Ray Flare From Mrk 421 Observed with VERITAS Author: Amy Furniss (UC Santa Cruz) for the VERITAS Collaboration Queries: afurniss@ucsc.edu Posted: 14 Jan 2026; 01:33 UT Subjects:TeV, VHE, Blazar We report the VERITAS detection of a very-high-energy flare of the famous blazar Mrk 421. A preliminary analysis, considering an energy threshold of 500 GeV, shows a flux above 250% Crab on January 10, 2026 (UTC), a peak up to ~400% Crab (2.5 +/- 0.3)e-6 m^-2 s^-1 on January 11, and a flux decrease down to ~170% Crab in our latest observations on January 13. The long-term VERITAS lightcurve suggests a once-per-decade event. As Mrk 421 is still in an active state, we strongly encourage multiwavelength follow-up on this exceptional flare. VERITAS will continue to perform daily observations of Mrk 421 as long as feasible. Questions regarding the VERITAS observations should be directed to Amy Furniss (afurniss@ucsc.edu). VERITAS (Very Energetic Radiation Imaging Telescope Array System) is located at the Fred Lawrence Whipple Observatory in southern Arizona, USA, and is most sensitive to gamma rays between 85 GeV and 30 TeV (http://veritas.sao.arizona.edu). ------------------------------------------------------------------------------ Password Certification: Amy Furniss (afurniss@ucsc.edu) https://www.astronomerstelegram.org/?read=17594 ============================================================================== ============================================================================== 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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