https://www.astronomerstelegram.org Nova, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=17830 A. Nucara, Z. J. Smeaton, A. Simongini, M. Arias, on behalf of the RISE collaboration A. Nucara, Z. J. Smeaton, A. Simongini, M. Arias, on behalf of the RISE collaboration andrea.simongini@inaf.it Credentialed by: Andrea Simongini (andrea.simongini@inaf.it) The Astronomer's Telegram ATel17830 We report radio and millimeter detection of the Type II supernova SN 2007it in NGC 5530 (distance 12.2 Mpc), obtained as part of the Rebrightening in Interacting Supernova Emission (RISE) initiative. ... 2026-06-04T14:00:20-00:00 https://www.astronomerstelegram.org/?read=17826 K. Hornoch, H. Kucakova, A. W. Shafter K. Hornoch, H. Kucakova, A. W. Shafter k.hornoch@centrum.cz Credentialed by: Allen W. Shafter (ashafter@sdsu.edu) The Astronomer's Telegram ATel17826 We report the discovery of a probable nova found during our survey of the central region of M31. The object was discovered on a co-added 600-s R-band CCD frame taken on 2026 Jun. ... 2026-06-02T02:24:58-00:00 https://www.astronomerstelegram.org/?read=17825 W. F. Wen, C. Y. Dai, Q. Y. Wu, H. Sun W. F. Wen, C. Y. Dai, Q. Y. Wu, H. Sun ep_ta@bao.ac.cn Credentialed by: Yuan Liu (liuyuan@bao.ac.cn) The Astronomer's Telegram ATel17825 Following the detection of the X-ray transient EP260530a (Wu et al., ATel 17824), we performed a follow-up observation with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe mission. ... 2026-06-01T08:50:12-00:00 https://www.astronomerstelegram.org/?read=17813 J. Strader, L. Chomiuk, A. Crossland, K. Z. Stanek, C. S. Kochanek, B. J. Shappee J. Strader, L. Chomiuk, A. Crossland, K. Z. Stanek, C. S. Kochanek, B. J. Shappee strader@pa.msu.edu Credentialed by: Jay Strader (strader@pa.msu.edu) The Astronomer's Telegram ATel17813 ASASSN-26no was discovered by the ASAS-SN survey on 2026 May 24 (UT 00:43) with g=8.6, however, it is recovered in ASAS-SN from 2026 May 11 onward at g < 10. ... 2026-05-26T02:43:43-00:00 https://www.astronomerstelegram.org/?read=17810 K. Hornoch, A. W. Shafter, M. Myslivec, H. Kucakova K. Hornoch, A. W. Shafter, M. Myslivec, H. Kucakova k.hornoch@centrum.cz Credentialed by: Allen W. Shafter (ashafter@sdsu.edu) The Astronomer's Telegram ATel17810 We report the discovery of a possible symbiotic nova in M31 on a co-added 3600-s R-band CCD frame taken on 2022 Oct. 26.135 UT with the 40-in reflector at SDSU's Mount Laguna Observatory (MLO). ... 2026-05-22T18:49:46-00:00 https://www.astronomerstelegram.org/?read=17807 K. Hornoch, H. Kucakova, A. W. Shafter K. Hornoch, H. Kucakova, A. W. Shafter k.hornoch@centrum.cz Credentialed by: Allen W. Shafter (ashafter@sdsu.edu) The Astronomer's Telegram ATel17807 We report the discovery of a probable nova in M81 on a co-added 5280-s unfiltered CCD frame taken on 2026 May 17.874 UT with the 0.65-m telescope at Ondrejov. ... 2026-05-19T19:27:37-00:00 https://www.astronomerstelegram.org/?read=17806 M. Dennefeld M. Dennefeld dennefel@iap.fr Credentialed by: Michel Dennefeld (dennefel@iap.fr) The Astronomer's Telegram ATel17806 The spectra presented in ATel 17805 concern the Nova AT2026 lck, and not clk...Sorry for the typo and thanks to Pierre Jean for spotting it. 2026-05-19T09:32:59-00:00 https://www.astronomerstelegram.org/?read=17805 C. Buil, M. Dennefeld, on behalf of the RAPAS group C. Buil, M. Dennefeld, on behalf of the RAPAS group dennefeld@iap.fr Credentialed by: Michel Dennefeld (dennefel@iap.fr) The Astronomer's Telegram ATel17805 Spectra of AT2026clk were obtained on May17, 2026, by C.Buil (from the STAROS project, and member of RAPAS) with his 0.2m Newton telescope located at Antibes in the south of France. ... 2026-05-18T12:05:45-00:00 https://www.astronomerstelegram.org/?read=17804 Viraj Karambelkar, Danielle Frostig, Kishalay De, Tanishk Mohan and the WINTER collaboration. Viraj Karambelkar, Danielle Frostig, Kishalay De, Tanishk Mohan and the WINTER collaboration. vk2588@columbia.edu Credentialed by: Viraj Karambelkar (vk2588@columbia.edu) The Astronomer's Telegram ATel17804 We report the identification and spectroscopic observations of a bright optical and near-IR (NIR) transient found in the regular survey operations of the the Zwicky Transient Facility (ZTF, Bellm et al. ... 2026-05-15T18:04:58-00:00 https://www.astronomerstelegram.org/?read=17803 K. W. Davis, R. J. Foley K. W. Davis, R. J. Foley kywdavis@ucsc.edu Credentialed by: Ryan Foley (foley@ucsc.edu) The Astronomer's Telegram ATel17803 We report the classification of AT 2026mko from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2026 May 15 UT. ... 2026-05-15T16:55:34-00:00