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

ATel 17725: AX Per returning to lower state after outburst

19 Mar 2026 at 2:01pm
In this telegram we are presenting multicolor photometric observations of AX Per from AO Shumen. According to S. N. Shore et al. (ATel #17630) there was an outburst in mid January increasing the star's brightness in V band with half magnitude. ... Read more...

ATel 17721: Independent Discovery of a Probable Nova in M31, AT 2026fkb

12 Mar 2026 at 10:03pm
We report the independent discovery of a probable nova found during our survey of the central region of M31. The object was discovered on a co-added 840-s R-band CCD frame taken on 2026 Mar. ... Read more...

ATel 17717: Spectroscopic Classification of Astrophysical Transients with the...

11 Mar 2026 at 9:07pm
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2026 March 11 UT. ... Read more...

ATel 17716: Optical follow-up of IGR J06074+2205

10 Mar 2026 at 11:18pm
Nakajima et al. in ATel #17714 reported an X-ray alert from MAXI/GSC of the HMXB IGR J06074+2205 with peak intensity on March 7 2026 at 0.030 c/s/cm2. This epoch is in fair agreement with the expectation from the recurrence period of 80 +/-2 days given by Mihara et al. ... Read more...

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...


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