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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 D85C614ECD; Tue, 5 Aug 2025 09:11:15 +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 9F28F14EA6 for <stefano@bicar.it>; Tue, 5 Aug 2025 09:11:13 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id F37C42880796 for <stefano@bicar.it>; Tue, 5 Aug 2025 03:11:11 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17319, 17320 Message-Id: <20250805071111.F37C42880796@server.astronomerstelegram.org> Date: Tue, 5 Aug 2025 03:11:11 -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 #17319 ATEL #17319 Title: Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ PKS 1045-18 Author: S. Rani (Michigan Technological University), G. La Mura (INAF - Astronomical Observatory of Cagliari), on behalf of the Fermi Large Area Telescope Collaboration Queries: rani@mtu.edu Posted: 4 Aug 2025; 21:32 UT Subjects:Gamma Ray, >GeV, AGN, Blazar, Quasar 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 (FSRQ) PKS 1045-18, also known as 4FGL J1048.0-1912 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates R.A. = 162.02759 deg, Dec. = -19.15992 deg (J2000; Xu et al. 2019, ApJS, 242, 5), and redshift z=0.595 (Stickel et al. 1993, A&AS, 97, 483). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on August 3, 2025, 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 of more than 160 relative to the average flux reported in the fourth data release of the fourth Fermi-LAT catalogue (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 spectrum than the 4FGL-DR4 value of 2.47 +/- 0.13. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Shikha Rani (rani@mtu.edu). 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=17319 ============================================================================== ATEL #17320 ATEL #17320 Title: Multi-band optical photometry of novae AT2025qdc and AT2025qsm in M31 Author: M. Petkova, A. Valcheva, E. Zaharieva, E. Ovcharov (Sofia University, Bulgaria) Queries: valcheva@phys.uni-sofia.bg Posted: 5 Aug 2025; 06:06 UT Subjects:Optical, Nova, Transient We report BVR photometry of two bright M31 transients: AT2025qdc (= PNV J00425628+4114512) (= M31N 2025-07a) independently discovered by R. Fidrich on 2025 Jul 03.109 UT and Hornoch et al. on 2025 Jul 2.448 UT (ATel #17265), and AT2025qsm (= PNV J00424863+4113513) discovered on 2025 Jul 10.132 UT by J. Zhao. Both are spectroscopically classified as novae by C. Balcon. The observations were carried out with a 35 cm Schmidt Cassegrain telescope + CCD SBIG STX-16803 and filters at the student Space and Earth Sciences Summer School "Prof. Marin Bachevarov", Pamporovo, Bulgaria on July 19, 2025. The B-, V- and R-band magnitudes were derived from 3x120 sec co-added frames and stars from Massey et al.(2016) were used for photometric calibration. Additionally, we carried out observations using narrowband H-alpha (FWHM of 3 nm) with the focal reducer FoReRo2 mounted on the 2m RCC telescope at Rozhen NAO, Bulgaria. The magnitudes in H-alpha were derived from 3x300 sec co-added frames. R-band magnitudes from the 2m telescope are also available and are derived from 3x120 sec co-added frames. The photometric calibration was performed using standard stars from Massey et al.(2016). The following magnitudes were obtained: AT2025qdc 2025 Jul 19.923 UT, B = 18.10 ± 0.30 mag 2025 Jul 19.928 UT, V = 18.10 ± 0.20 mag 2025 Jul 19.918 UT, R = 17.75 ± 0.15 mag 2025 Jul 26.957 UT, H-alpha = 15.87 ± 0.02 mag 2025 Jul 26.949 UT, R = 18.49 ± 0.05 mag AT2025qsm 2025 Jul 19.923 UT, B = 17.60 ± 0.20 mag 2025 Jul 19.928 UT, V = 17.50 ± 0.10 mag 2025 Jul 19.918 UT, R = 16.70 ± 0.07 mag 2025 Jul 26.957 UT, H-alpha = 14.62 ± 0.01 mag 2025 Jul 26.949 UT, R = 17.65 ± 0.02 mag Both transients show strong H-alpha emission and R-band magnitude decline consistent with their classification as novae. The study was supported by the National RI Roadmap Project D01-109/30.06.2025 with the Ministry of Education and Science of the Republic of Bulgaria. ------------------------------------------------------------------------------ Password Certification: Antoniya Valcheva (valcheva@phys.uni-sofia.bg) https://www.astronomerstelegram.org/?read=17320 ============================================================================== ============================================================================== 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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