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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 D00FE14569; Thu, 23 Jul 2026 09:05:57 +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, 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 E4EB2144C0 for <stefano@bicar.it>; Thu, 23 Jul 2026 09:05:53 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id A6D2C28808E0 for <stefano@bicar.it>; Thu, 23 Jul 2026 03:05:52 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17920, 17921 Message-Id: <20260723070552.A6D2C28808E0@server.astronomerstelegram.org> Date: Thu, 23 Jul 2026 03:05:52 -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 #17920 ATEL #17920 Title: Fermi-LAT detection of a flaring gamma-ray source associated with the FSRQ B3 0151+474 Author: C. C. Cheung (NRL), P. Monti-Guarnieri (University of Trieste and INFN Trieste), G. La Mura (INAF - Astronomical Observatory of Cagliari), on behalf of the Fermi Large Area Telescope Collaboration Queries: Teddy.Cheung@nrl.navy.mil Posted: 22 Jul 2026; 20:04 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 gamma-ray emission from a source positionally consistent with the flat-spectrum radio quasar B3 0151+474, also known as FL16Y J0155.0+4742 (Ballet et al. 2026, arXiv:2602.22148), with radio coordinates R.A. = 28.73454 deg, Dec. = 47.72404 deg (J2000; Fey et al. 2004, AJ, 127, 3587), and redshift z=1.026 (Vermeulen & Taylor 1995, AJ, 109, 1983). Preliminary analysis indicates that this source was in an elevated gamma-ray emission state from 2026 Jul 13-20, with a weekly averaged gamma-ray flux (E>100MeV) of (1.0 +/- 0.3) X 10^-7 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 40 relative to the average flux reported in the LAT 16-year Source List (FL16Y; Ballet et al. 2026, arXiv:2602.22148). The corresponding photon index is 1.9 +/- 0.2, indicating a significantly harder spectrum than the FL16Y value of 2.30 +/- 0.17. During this time interval, the highest-energy event associated with the source was a 14 GeV photon (with association probability p > 0.99) detected at 05:55:37.621 UT on Jul 20. The transient was identified thanks to the method implemented within the Fermi-LAT Collaboration known as "Fermi All-sky Variability Analysis" (report link is: https://fermi.gsfc.nasa.gov/ssc/data/access/lat/FAVA/SourceReport.php?week=937&flare=21) that searches the sky for high-energy transients on weekly time scales (Ackermann et al. 2013, ApJ, 771, 57; Abdollahi et al. 2017, ApJ, 846, 34). 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 C.C. Cheung (Teddy.Cheung at nrl.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: Teddy Cheung (Teddy.Cheung@nrl.navy.mil) https://www.astronomerstelegram.org/?read=17920 ============================================================================== ATEL #17921 ATEL #17921 Title: FRB 20121102A is exhibiting hyperactivity with increased RM value at L-band detected by FAST Author: Junshuo Zhang(NAOC), Dejiang Zhou(NAOC), Yi Feng(Zhejiang Lab), Chengwei Liang(GZHU), Chenyuan Xu (Zhejiang Lab), Jiarui Niu(NAOC), Xiaohui Liu(NAOC), Yongkun Zhang(NAOC), Pei Wang(NAOC), Di Li(THU, NAOC), Weiwei Zhu(NAOC), Bing Zhang(HKU), Jinlin Han(NAOC), Wenfei Yu(SHAO), Kejia Lee(PKU\&NAOC), Ye Li(PMO), Rui Luo(GZHU), Jinhuang Cao(NAOC), Wanjin Lu(NAOC) and FAST FRB Key Science Project Collaboration Queries: zhangjs@bao.ac.cn Posted: 23 Jul 2026; 02:55 UT Subjects:Radio, Request for Observations, Transient, Fast Radio Burst We report the detection of a burst storm from FRB 20121102A with FAST, with a burst rate of ~490 hr<sup>-1</sup> above a fluence threshold of 0.015 Jy ms, suggesting that this repeater has entered another highly active episode at L band. The observation began at MJD 61238.99860 and lasted 1800 s, with pulsar-backend data recorded at a sampling time of 49.152 microseconds using 4096 frequency channels covering 1.0 GHz to 1.5 GHz. This burst storm of FRB 20121102A at L band appears to align with the proposed periodicity of ~160 days (Rajwade et al. 2020; Cruces et al. 2020; Braga et al. 2025; Wang et al. 2025), consistent with our previous report in ATel #17642. We detected a bright burst with a topocentric arrival time of MJD 61239.014431797 at a reference frequency of 1.5 GHz. The RM of this burst was 35,645 +/- 10 rad m<sup>-2</sup>, with a linear polarization fraction of ~10% at L band. This value showed an anomalous increase of about 14,000 rad m<sup>-2</sup> compared with that reported in our previous ATel #17642 in February 2026. The best-fit DM of this burst, obtained through DM-phase package, is 536.9+/-0.1 pc cm<sup>-3</sup>, roughly 2 pc cm<sup>-3</sup> lower than those reported by ATel #17633 and ATel #17642, consistent with the decreasing trend reported in Wang et al. 2025. We encourage further follow-up observations with multi-band facilities. FAST is a Chinese national mega-science facility built and operated by the National Astronomical Observatories, Chinese Academy of Sciences (NAOC). We thank all members of the FAST FRB Key Science Project collaboration for their support and assistance during the observations. Rajwade, K. M.; Mickaliger, M. B.; Stappers, B. W. et al., 2020, MNRAS, 495, 3551 Cruces, M.; Spitler, L. G.; Scholz, P. et al., 2021, MNRAS, 500, 448 Braga, C. A.; Cruces, M.; Cassanelli, T.; Espinoza-Dupouy, M. C. et al., 2025, A&A, 693, A40 Wang, P.; Zhang, J.-S.; Yang, Y.-P. et al., 2025, ArXiv, 2507.15790 ------------------------------------------------------------------------------ Password Certification: Pei Wang (wangpei@nao.cas.cn) https://www.astronomerstelegram.org/?read=17921 ============================================================================== ============================================================================== 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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