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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 5BC4A1470B; Sun, 1 Feb 2026 08:13:08 +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 484AA144C4 for <stefano@bicar.it>; Sun, 1 Feb 2026 08:12:38 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 50F9D288079E for <stefano@bicar.it>; Sun, 1 Feb 2026 02:12:37 -0500 (EST) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17640, 17641 Message-Id: <20260201071237.50F9D288079E@server.astronomerstelegram.org> Date: Sun, 1 Feb 2026 02:12:37 -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 #17640 ATEL #17640 Title: Fermi LAT detection of renewed gamma-ray activity from the FSRQ PKS 0202-17 Author: F. Casaburo (INAF & Astronomical Observatory of Rome, INFN & Rome Tor Vergata, Sapienza University Rome,), C. Bartolini (University of Trento & INFN Bari), S. Ciprini (INFN - Rome Tor Vergata & ASI- SSDC), G. La Mura (INAF-OACa), P. Monti-Guarnieri (University of Trieste & INFN Trieste), on behalf of the Fermi Large Area Telescope Collaboration Queries: fausto.casaburo@roma2.infn.it Posted: 31 Jan 2026; 08:46 UT Subjects:Gamma Ray, >GeV, Blazar, Quasar 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 FSRQ PKS 0202-17, also known as 4FGL J0205.0-1700 (The Fermi-LAT collaboration 2020, ApJS, 247, 1), with coordinates R.A. = 31.24031 deg, Decl. = -17.02218 deg (J2000; Fey et al. 2004, AJ, 128, 2593), and redshift z= 1.739 (Jones et al. 2009, MNRAS, 399, 683). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on January 29, 2026, with a daily averaged gamma-ray flux (E>100MeV) of (0.7+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor more than 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). The corresponding photon index is 2.2+/-0.2, indicating a marginally harder spectrum than the one corresponding to the 4FGL-DR4 value of 2.49+/-0.02.. The Fermi-LAT Collaboration has previously reported flaring activity from this source in ATels #15311 and #14801. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source belongs to the list of LAT daily monitored sources, therefore a daily light curve can be accessed at <a href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PKS_0202-17">PKS 0202-17</a>. A preliminary light curve for PKS 0202-17 can also be accessed via the Fermi-LAT Light-Curve Repository at <a href=" https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J0205.0-1700 ">4FGL J0205.0-1700</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Isabella Mereu (mereuisabella[at]gmail[dot]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: Giovanni La Mura (giovanni.lamura@inaf.it) https://www.astronomerstelegram.org/?read=17640 ============================================================================== ATEL #17641 ATEL #17641 Title: The blazar 3C345 --- at own maximae after 70 days Author: V. V. Vlasyuk, O. I. Spiridonova, A. S. Moskvitin (Special Astrophysical Observatory of the Rus. Ac. Sci.) Queries: mosk@sao.ru Posted: 31 Jan 2026; 17:39 UT Subjects:Optical, Blazar The blazar 3C 345 is still at high activity phase. After decade maximum (R = 14.48 +/- 0.01 mag, MJD 60995.66, ATel#17498) it undergone fast brightness dimming with 2 different slopes: near 0.2 mags per day at first time and ~0.04 mags per day after few light fluctuations around 15.2 mag. The dimming phase terminated at level R ~ 16.0 mag at the middle of December (MJD 61030). After a month interval of partial invisibility we detected start of new blazar brightening phase at level R ~ 15.4 mag (MJD 61055). The following re-brightening phase was some faster, having light curve slope near -0.08 mags per day and completed by local maximum at R = 14.57 +/- 0.02 mag (MJD 61067.0). So, just after 70 days of intermediate flux the blazar 3C 345 approached second position in apparent brightness over last decade. Our last estimates suggest that 3C345 became as faint as R = 15.1 mag after fast dimming with slope about 0.3 mags per day. The monitoring of the blazar 3C 345 is continuing: the most of data presented were taken with SAO RAS 1-m and 0.5-m reflectors under good weather condition (seeing (FWHM) < 2 arcsec and good transparency) and have typical accuracy of individual flux estimates about 0.005 mag. We strongly encourage further multi-wavelength studies. ------------------------------------------------------------------------------ Password Certification: Alexander Moskvitin (mosk@sao.ru) https://www.astronomerstelegram.org/?read=17641 ============================================================================== ============================================================================== 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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