The Astronomer’s Telegram is a system for reporting and commenting on new astronomical observations. The latest reports are listed here.

ATel 17708: HCT followup observations of SN2026ejy.

5 Mar 2026 at 2:49pm
We report on the spectroscopic followup of SN2026ejy (O’Neill et al., 2026, TNSDiscovery Report, 2026-804:1., and, Jha et al., 2026, TNS Classification Report, 2026-850:1) taken on 2026-02-28 UTC 23:12:26 from the Himalayan Chandra Telescope (HCT). ... Read more...

ATel 17707: Fermi J1820-1648: Upper limits from a neutrino search with IceCube

3 Mar 2026 at 11:31pm
The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search for track-like muon neutrino events arriving from the direction of Fermi J1820-1648, a transient in the Galactic plane, following reports from Fermi LAT (ATels #17688, #17699), SOAR (ATel #17700) and ot... Read more...

ATel 17704: Fermi J1820-1648: SMA Detection of Bright Millimeter Emission

27 Feb 2026 at 10:05pm
We observed the classical nova Fermi J1820-1648 (ATel #17688, #17698, #17699, #17700) with the Submillimeter Array (SMA) on 27 February 2026 UT. The SMA realtime quicklook pipeline POLARIS showed the source was detected with high SNR even as the observations were continuing. ... Read more...

ATel 17703: AT 2026epw: Discovery of a possible nova from Vera C. Rubin Obser...

27 Feb 2026 at 9:00pm
We report the discovery of a possible Nova found in the Vera C. Rubin Observatory commissioning alert stream via the Babamul broker (du Laz et al., 2025). ... Read more...

ATel 17702: Rapid decline in brightness of the red nova remnant V838 Mon

27 Feb 2026 at 5:32pm
We report a rapid decline in the brightness of the red nova remnant V838 Mon following its light maximum around September 25, 2025 (B & #61; 15.03, V & #61; 12.75, RC & #61; 10.70, IC & #61; 8.48 mag). ... Read more...

ATel 17700: SOAR spectroscopic classification of the Galactic plane gamma-ray...

25 Feb 2026 at 7:40pm
We report optical spectroscopic follow-up observations of the candidate optical counterpart (ATel #17698) to the Galactic-plane gamma-ray transient Fermi J1820-1648, discovered by Fermi-LAT on 2026-02-18.7 (ATels #17688, #17699). ... Read more...

ATel 17698: Possible optical counterpart to the Galactic plane gamma-ray tran...

24 Feb 2026 at 10:02pm
We imaged the region of the gamma-ray transient Fermi J1820-1648 (ATel #17688, #17689) on 2026-02-22.5087 UTC with a 0.3-m telescope + QHY268M CMOS camera located at TTU Preston Gott Skyview Observatory (Shallowater, Texas). ... Read more...

ATel 17694: Independent Discovery of a Probable Nova in M81, M81N 2026-02a

23 Feb 2026 at 5:54am
We report the independent discovery of a probable nova in M81 on a co-added 6030-s unfiltered CCD frame taken on 2026 Feb. 20.893 UT with the 0.65-m telescope at Ondrejov. ... Read more...

ATel 17692: Discovery of a Probable Nova in M31, M31N 2026-02a

20 Feb 2026 at 7:39pm
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 1080-s R-band CCD frame taken on 2026 Feb. ... Read more...

ATel 17683: Additional Photometry of a Possible Very Slowly Evolving Nova, M3...

16 Feb 2026 at 7:35pm
In ATel #17576 we reported independent discovery of a possible very slowly evolving nova in M31 designated PNV J00432344+4124357 = M31N 2025-12f = AT 2025ajxy, and as ZTF25acghjar by the ZTF. ... Read more...


The Astronomer’s Telegram Resources

The Astronomer’s Telegram Homepage
The Astronomer’s Telegram (ATEL) is a web-based short-notice (<4000 characters) publication system for reporting and commenting on new astronomical observations, offering for the first time in astronomy effectively instantaneous distribution of time-critical information for the entire professional community.

The Astronomer’s Telegram: A Web-based Short-Notice Publication System for the Professional Astronomical Community
An article describing what The Astronomer’s Telegram is all about.