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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 90C68145DD; Sun, 15 Feb 2026 08:12:45 +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 5A70B1453F for <stefano@bicar.it>; Sun, 15 Feb 2026 08:12:03 +0100 (CET) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 237FE2880885 for <stefano@bicar.it>; Sun, 15 Feb 2026 02:12:02 -0500 (EST) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17680, 17681 Message-Id: <20260215071202.237FE2880885@server.astronomerstelegram.org> Date: Sun, 15 Feb 2026 02:12:02 -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 #17680 ATEL #17680 Title: SVOM/ECLAIRs detection of an X-ray rebrightening from the BHXB AT2019wey Author: S. Le Stum (APC, France), M. Brunet (IRAP, F), F. Cangemi (APC, F), A. Coleiro (APC, F), L. Tao (IHEP, China), L. Zhang (IHEP, C) Queries: lestum@apc.in2p3.fr Posted: 14 Feb 2026; 17:33 UT Subjects:X-ray, Binary, Black Hole We report on the detection of AT2019wey (=ATLAS 19bcxp) by the ECLAIRs coded-mask instrument on board the SVOM mission. The source was automatically detected by the Quicklook Analysis of the X band data received on the ground for the first time at 2026-02-12T12:16 after 5.2 ks of exposure. The source was detected with a SNR of 18 and a count rate of 11 counts/s (22 mCrab) in the 4-40 keV energy range. The ECLAIRs localization is R.A. = 68.9 deg, Dec = 55.3 deg (J2000) with a statistical uncertainty of 0.1 deg in radius (90% confidence level). The center of the ECLAIRs position is 0.08 deg away from AT2019wey, i.e., well within the position uncertainties. A preliminary spectral analysis shows that the 4-100 keV spectrum can be suitably fitted (chi2/dof = 27.95/22) with a cutoffpl model with a photon index Gamma = 1.0 +/- 0.4, and a cut-off energy of 19 (+14 / -7) keV. The derived unabsorbed flux in the 4-100 keV band is [8.1 (-7.0 /+0.5)]e-10 erg/s/cm^2. Refined analysis is ongoing. The source was last reported in ATel #17190 in a soft spectral state, with no significant emission detected above 4 keV. The present detection suggests either the onset of a new outburst or a significant hardening of the X-ray spectrum. The source was not detected in earlier ECLAIRs pointings, supporting the interpretation of a recent change in its X-ray activity. AT2019wey was first identified as an optical transient in December 2019 and subsequently detected in X-rays during an outburst in 2020 (ATels #13571, #13932, #13948, #13976, #14100). Based on its X-ray, optical, and radio properties, the source was later classified as a candidate black hole X-ray binary (Yao et al. 2021, ApJ, 920, 120). Further multi-wavelength follow-up observations are encouraged to follow the activity of the source. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by APC, CEA, CNES and IRAP. ------------------------------------------------------------------------------ Password Certification: Floriane Cangemi (cangemi@apc.in2p3.fr) https://www.astronomerstelegram.org/?read=17680 ============================================================================== ATEL #17681 ATEL #17681 Title: Fermi-LAT detection of renewed gamma-ray activity from the CSS 3C 138 Author: S. Rani (Michigan Technological University), T. Lewis (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: 14 Feb 2026; 21:27 UT Subjects:Gamma Ray, >GeV, AGN, 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 compact steep spectrum quasar 3C 138, also known as 4FGL J0521.2+1637 (Abdollahi et al. 2022, ApJS, 260, 53), with coordinates R.A. = 80.29119 deg, Dec. = +16.63946 deg (J2000, J2000; Truebenbach & Darling, 2017, ApJS, 233, 3) and redshift z = 0.759 (Lynds et al. 1966, ApJ, 144, 1244). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on February 11, 2026, with a daily averaged gamma-ray flux (E>100MeV) of (0.5 +/- 0.2) e-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of more than 100 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 2.0 +/- 0.2, consistent within uncertainties with the 4FGL-DR4 value of 2.2+/- 0.1. The Fermi-LAT Collaboration has previously reported flaring activity from this source in ATels #17461, #17180, #17107, and #16845. Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. A preliminary light curve for 3C 138 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_J0521.2+1637">4FGL J0521.2+1637</a>. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact persons are Ettore Bronzini (ettore.bronzini@inaf.it) and C.C. Cheung (chi.c.cheung2.civ@us.navy.mil). 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=17681 ============================================================================== ============================================================================== 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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