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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 00EF214ECD; Sat, 20 Jun 2026 09:05:37 +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 0DD89144AB for <stefano@bicar.it>; Sat, 20 Jun 2026 09:05:35 +0200 (CEST) Received: from server.astronomerstelegram.org (localhost [127.0.0.1]) by server.astronomerstelegram.org (Postfix) with ESMTP id 6383E28807B0 for <stefano@bicar.it>; Sat, 20 Jun 2026 03:05:34 -0400 (EDT) To: stefano@bicar.it From: atel@astronomerstelegram.org Subject: ATel 17849, 17850 Message-Id: <20260620070534.6383E28807B0@server.astronomerstelegram.org> Date: Sat, 20 Jun 2026 03:05:34 -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 #17849 ATEL #17849 Title: EP-FXT follow-up of the X-ray transient EP260617a Author: S. Q. Jiang (NAO, CAS), J. Yang (ZZU), and H. Sun (NAO, CAS) on behalf of the Einstein Probe (EP) team Queries: ep_ta@bao.ac.cn Posted: 19 Jun 2026; 08:32 UT Subjects:X-ray, Transient The Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission performed a follow-up observation of the X-ray transient EP260617a (ATel #17848) on 2026-06-18 09:59:15 (UTC), with a net exposure of 3 ks. No X-ray source was detected within the WXT error circle, with a 0.5-10 keV flux upper limit of 7e-14 erg/s/cm^2. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). ------------------------------------------------------------------------------ Password Certification: Yuan Liu (liuyuan@bao.ac.cn) https://www.astronomerstelegram.org/?read=17849 ============================================================================== ATEL #17850 ATEL #17850 Title: EP260617a: optical observations with LCO Author: Gregory Corcoran (UCD), Andrew J. Levan (Radboud and Warwick), Daniele B. Malesani (DAWN/NBI and Radboud), Rob A. J. Eyles-Ferris (Leicester), Jonathan Quirola-Vasquez (Radboud), Antonio Martin-Carrillo (UCD), Peter G. Jonker (Radboud), Jennifer Chacon (PUC) Queries: daniele.malesani@nbi.ku.dk Posted: 19 Jun 2026; 14:37 UT Subjects:Optical, X-ray, Gamma-Ray Burst, Star, Transient, Variables We observed the location of the X-ray transient EP260617a (Jiang et al., ATel #17848; ATel #17849) using an LCO 1m telescope located at the Teide Observatory (Spain) equipped with the SINISTRO instrument. We obtained 6x300 s exposures in the SDSS-r filter starting on 2026-06-18 at 21:05:41 UT (mid time of the exposure: 43.35 hr after the first detection by EP/WXT). Image subtraction was carried out against the Legacy Survey images of this field. No new sources are visible within the EP/WXT error localization. The 3-sigma limiting magnitude of our LCO image is r > 22.7 (AB), calibrated against the Pan-STARRS catalog and not corrected for Galactic extinction. We note the presence of an historically strongly variable star inside the WXT error circle, at coordinates: RA = 13:56:02.39<br /> Dec = -01:36:26.4 In our observation, the star has a magnitude r = 15.55 +- 0.01, which is consistent with recent measurements from ZTF (e.g. <a href="https://alerce.online/object/ZTF18abcvnmf">https://alerce.online/object/ZTF18abcvnmf</a>). The star distance, while not measured, is > 1 kpc given the lack of parallax measurement in Gaia. This previous monitoring is suggestive of large amplitude variability (spanning one magnitude peak to trough, although with some variation in amplitude) with a period of 210 days. The relationship of this star with the EP event remains unclear, though we note that such high-amplitude variables are rare in the sky, especially outside the Galactic plane. ------------------------------------------------------------------------------ Password Certification: Daniele Malesani (daniele.malesani@nbi.ku.dk) https://www.astronomerstelegram.org/?read=17850 ============================================================================== ============================================================================== 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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