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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 1D1AF14AF9; Wed, 27 Aug 2025 09:11:09 +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 D82BE1489C for <stefano@bicar.it>; Wed, 27 Aug 2025 09:11:06 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 1A3872880845 for <stefano@bicar.it>; Wed, 27 Aug 2025 03:11:05 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17359, 17360 Message-Id: <20250827071105.1A3872880845@server.astronomerstelegram.org> Date: Wed, 27 Aug 2025 03:11:05 -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 #17359 ATEL #17359 Title: Fermi-LAT detection of renewed gamma-ray activity from the high-redshift FSRQ PKS 0601-70 Author: F. Longo (University of Trieste and INFN Trieste) and A. Holzmann Airasca (University of Trento & INFN Bari), on behalf of the Fermi Large Area Telescope Collaboration Queries: a.holzmannairasca@unitn.it Posted: 26 Aug 2025; 07:06 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 PKS 0601-70, also known as 4FGL J0601.1-7035 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates R.A. = 90.29717 deg, Dec. = -70.60239 deg (J2000; Healey et al. 2007, ApJS, 171, 61), and redshift z=2.409 (Shaw et al. 2012, ApJ, 748, 49). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on August 24, 2025, with a daily averaged gamma-ray flux (E>100MeV) of (0.5+/-0.2) 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 Fermi-LAT catalog (4FGL-DR4, Ballet et al. 2023, arXiv:2307.12546). The corresponding photon index is 2.3+/-0.3, and is consistent with the 4FGL-DR4 value of 2.37 +/- 0.02 within the uncertainties. The Fermi-LAT Collaboration has previously reported enhanced activity from this source in ATel #13506. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. A preliminary light curve for PKS 0601–70 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_J0601.1-7035">4FGL J0601.1-7035</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is I. Mereu (isabella.mereu@pg.infn.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: Chiara Bartolini (chiara.bartolini-1@unitn.it) https://www.astronomerstelegram.org/?read=17359 ============================================================================== ATEL #17360 ATEL #17360 Title: Apparent Outburst of Cometary Centaur C/2023 RS61 (PANSTARRS) Author: Michael S. P. Kelley (Univ. Maryland), Helen Usher (The Open University), Megan E. Schwamb (Queen's University Belfast), Carrie E. Holt (Las Cumbres Observatory), on behalf of the Zwicky Transient Facility Collaboration, the LCO Outbursting Objects Key Project, and the Comet Chasers Project Queries: msk@astro.umd.edu Posted: 26 Aug 2025; 19:59 UT Subjects:Optical, Comet We report on Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP 131, a8002) observations of an apparent outburst of cometary centaur C/2023 RS61 (PANSTARRS). The comet brightened by at least -2.2 mag in relative brightness over a period of 45 hours. It was initially undetected in two g-band images taken 2025 Aug 8.473 and 8.485 UTC with 5-sigma g-band lower limits of 20.6 mag. At 2025 Aug 10.370 UTC, the comet was detected with i = 17.90 ± 0.11 mag. In the next observations at 2025 Aug 11.352 and 11.471, the comet was slightly brighter at i=17.49 ± 0.11 mag and g=18.45 ± 0.07 mag, respectively. The comet's apparent brightness has remained near constant since, most recently measured to be g=18.41 ± 0.03 mag at 2025 Aug 25.478 UTC, and its morphology compact with a FWHM of 3.0 arcsec in 1.9 arcsec seeing. All photometry is reported for 5 arcsec radius apertures using the PS1 photometric system. At the time of the outburst, the comet was 8.98 au from the Sun and 9.06 au from the Earth, with a phase angle of 6.4 deg. With a calculated color of g-i = 0.96 ± 0.13 mag from Aug 11, and g-r = 0.72 ± 0.04 mag measured on Aug 24, the object appears to be unusual for a cometary coma. Follow-up observations from a 1-m Las Cumbres Observatory telescope at McDonald Observatory and the 2-m Faulkes Telescope North confirm the colors: g-r = 0.73 ± 0.04 mag, r-i = 0.35 ± 0.04 mag (Aug 26.431 UTC); and g-r = 0.77 ± 0.03 mag, r-i = 0.36 ± 0.03 mag, i-z = 0.17 ± 0.03 mag (Aug 26.565), respectively. In a study of 7300 color measurements of 225 comets with the ZTF, only two comets were measured to be redder than g-r = 0.65 mag (Kelley et al. 2024, 56th AAS Division for Planetary Sciences Meeting, #401.01). In addition, the outburst ejecta is redder than the comae of most active centaurs (e.g., Jewitt 2015, AJ 150, 201; Mazzotta Epifani et al. 2018, A&A 620, A93). Further characterization of this event and the object in general is encouraged. The next perihelion will occur in 2028 November. Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW. This work makes use of observations from the Las Cumbres Observatory global telescope network. This work is based on observations made with the MuSCAT3 instrument, developed by Astrobiology Center and under financial supports by JSPS KAKENHI (JP18H05439) and JST PRESTO (JPMJPR1775), at Faulkes Telescope North on Maui, HI, operated by the Las Cumbres Observatory. The UK-based Comet Chasers project works with students and educators across the world, engaging and supporting them in making scientific observations (with the Las Cumbres Observatory global telescope network) of comets and other small bodies for researchers. The project is grateful for support from the Faulkes Telescope Project, the Open University, Cardiff University, the Royal Astronomical Society and the Science and Technology Facilities Council in the UK. ------------------------------------------------------------------------------ Password Certification: Carrie Holt (cholt@lco.global) https://www.astronomerstelegram.org/?read=17360 ============================================================================== ============================================================================== 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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