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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 12DD1146E4; Tue, 10 Mar 2026 08:04:03 +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=1.7 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 1A0541451D for <stefano@bicar.it>; Tue, 10 Mar 2026 08:03:20 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id A6B652880800 for <stefano@bicar.it>; Tue, 10 Mar 2026 03:03:19 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17715 Message-Id: <20260310070319.A6B652880800@server.astronomerstelegram.org> Date: Tue, 10 Mar 2026 03:03:19 -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 #17715 ATEL #17715 Title: The flaring blazar S5 1044+71 shows a significant increase in its optical brightness Author: Alessandro Marchini (Astronomical Observatory, DSFTA, University of Siena - Italy); Leonardo Stiaccini, Gaia Verna (Department of Physical Sciences, Earth and Environment (DSFTA), University of Siena - Italy); Giacomo Bonnoli (INAF - Brera Astronomical Observatory, Milan - Italy); Ivo Peretto, Giovanni Furlato, Stefano Lora, William Rivato (MarSEC, Marana di Crespadoro, Vicenza - Italy); Alessandro Nastasi, Sabrina Masiero, Alessio Squilloni (GAL Hassin - Centro Internazionale per le Scienze Astronomiche, Isnello, Palermo - Italy) Queries: gaia.verna@unisi.it Posted: 9 Mar 2026; 22:19 UT Subjects:Optical, AGN, Blazar, Transient In the last nights, we recorded an optical flare of the flat-spectrum radio quasar S5 1044+71 (R.A. = 10 48 27.62, Dec. = +71 43 35.94; J2000; Charlot et al. 2020, A&A, 644A, 159) at redshift z = 1.150 (Snellen et al. 2002, MNRAS, 329, 700). In the last few years, we regularly monitored this blazar as part of the <A HREF=”https://www.oato.inaf.it/blazars/webt/”>Whole Earth Blazar Telescope (WEBT)</A> collaboration. We report the brightness recorded in the R band of the Johnson-Cousins photometric systems in the last few months: Civil date (UT) Mag(R)(dMag) - Observatory 2025 Dec. 27.189 17.86 (0.08) - Siena 2026 Jan. 02.355 17.81 (0.06) - MarSEC 2026 Jan. 11.846 17.89 (0.04) - MarSEC 2026 Jan. 13.918 17.90 (0.14) - Gal Hassin 2026 Jan. 18.215 17.72 (0.11) - Siena 2026 Jan. 20.869 17.69 (0.07) - MarSEC 2026 Jan. 22.200 17.49 (0.08) - Siena 2026 Jan. 31.928 17.37 (0.07) - Siena 2026 Feb. 01.933 17.48 (0.11) - Siena 2026 Feb. 17.897 17.38 (0.05) - MarSEC 2026 Feb. 20.787 17.57 (0.09) - Siena 2026 Feb. 21.781 17.48 (0.09) - Siena 2026 Mar. 07.899 16.25 (0.01) - MarSEC 2026 Mar 09.893 16.56 (0.04) - Siena Reported uncertainty is statistical only. As a reference, the most recent measurements are approximately 1 mag brighter than those recorded just two weeks ago, but fainter than the record R-band magnitude of 14.96 observed in March 2023. Observations were conducted from the 0.30 m telescope of the Astronomical Observatory of the University of Siena (Siena, Italy - IAU MPC observatory code K54), the 0.36 m telescope of the Marana Space Explorer Centre (MarSEC, Vicenza, Italy) and the 0.40 m telescope of the GAL Hassin - Centro Internazionale per le Scienze Astronomiche (Isnello, Palermo, Italy - L34). Any inquiry on these observations can be addressed either to Alessandro Marchini (marchini@unisi.it) or to Gaia Verna (gaia.verna@unisi.it). We will continue monitoring the source in the following nights. Multi-wavelength follow-up is strongly encouraged. Brief descriptions of the instrumental setups used for the reported observations are available at the official webpage of the <A HREF="https://www.dsfta.unisi.it/en/research/labs/astronomical-observatory">Astronomical Observatory of the University of Siena</A>, on the website of the <A HREF="https://tinyurl.com/marsecsetup">MarSEC - Marana Space Explorer Center</A> and on the page of the <A HREF="https://galhassin.it/en/research/telescopes/">GAL Hassin - Centro Internazionale per le Scienze Astronomiche</A>. <center><A HREF="https://www.dsfta.unisi.it/en/research/labs/astronomical-observatory">Astronomical Observatory of the University of Siena - Official Webpage</A></center> ------------------------------------------------------------------------------ Password Certification: Gaia Verna (gaia.verna@unisi.it) https://www.astronomerstelegram.org/?read=17715 ============================================================================== ============================================================================== This is an automatically-generated notice. 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