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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 9E9B614C3D; Thu, 18 Sep 2025 09:12:10 +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 55B05144AD for <stefano@bicar.it>; Thu, 18 Sep 2025 09:12:07 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 53E5628807F2 for <stefano@bicar.it>; Thu, 18 Sep 2025 03:12:06 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17393, 17394 Message-Id: <20250918071206.53E5628807F2@server.astronomerstelegram.org> Date: Thu, 18 Sep 2025 03:12:06 -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 #17393 ATEL #17393 Title: Very high optical polarization of PKS 1725+123 Author: Rumen Bachev, IA-NAO, BAS Queries: bachevr@astro.bas.bg Posted: 17 Sep 2025; 16:37 UT Subjects:Optical, AGN, Blazar, Quasar Following reports of enhanced activity of the FSRQ blazar PKS 1725+123 in VHE (ATel #17344), gamma-rays (ATel #17316, ATel #17370), optical (ATel #17345) and radio wavelengths (ATel #17356), we started observing this object with the 60-cm Belogradchik telescope, Bulgaria. The blazar showed persistent, but very high optical (R-band) polarization, among the highest we have ever measured in a blazar. The results from the nights Sept. 15th and 16th are preliminary and are listed below. <table border="1"> <tr> <th>JD</th> <th>R-mag (err) </th> <th>P (err) [%]</th> <th>EVPA (err) [deg]</th> </tr> <tr> <td>2460934.26</td> <td>14.43 (0.05)</td> <td>35.2 (0.8) </td> <td>11.8 (0.5) </td> </tr> <tr> <td>2460935.24</td> <td>14.47 (0.05)</td> <td>36.2 (0.5)</td> <td>10.6 (0.7) </td> </tr> </table> Further observations are encouraged. This research was partially supported by the Bulgarian National Science Fund of the Ministry of Education and Science under grants KP-06-H68/4 (2022), KP-06-H78/5 (2023), and KP-06-H88/4 (2024). ------------------------------------------------------------------------------ Password Certification: Rumen Bachev (bachevr@astro.bas.bg) https://www.astronomerstelegram.org/?read=17393 ============================================================================== ATEL #17394 ATEL #17394 Title: Fermi-LAT detection of renewed gamma-ray activity from the FSRQ OI 280 Author: F. Longo (University of Trieste and INFN Trieste) and A. Holzmann Airasca (University of Trento and INFN Bari), on behalf of the Fermi Large Area Telescope Collaboration Queries: francesco.longo@ts.infn.it Posted: 17 Sep 2025; 19:04 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 renewed gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar OI 280, also known as 4FGL J0750.8+1229 (Abdollahi et al. 2020, ApJS, 247, 33), with coordinates R.A. = 117.71686 deg, Decl. = +12.51801 deg (J2000, Le Bail et al., 2016, AJ, 151, 79), and redshift z=0.889 (Jin et al. 2023, ApJS, 265, 25). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on September 16, 2025, with a daily averaged gamma-ray flux (E>100MeV) of (0.6+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 30 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 2.0+/-0.2 indicating a significantly harder spectral state than the one inferred from the average power-law spectral index of 2.44 +/- 0.03 reported in 4FGL-DR4. The Fermi LAT Collaboration has previously reported flaring activity from this source in ATel #17181. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. A preliminary light curve for OI 280 can 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_J0750.8+1229">4FGL J0750.8+1229</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Sarah Wagner (sarah.wagner@uni-wuerzburg.de). 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: Francesco Longo (francesco.longo@ts.infn.it) https://www.astronomerstelegram.org/?read=17394 ============================================================================== ============================================================================== This is an automatically-generated notice. 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