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

ATel 17868: Spectroscopic Classification of AT 2026rdg=ZTF26abemjfk as a Clas...

2 Jul 2026 at 10:35pm
I report the spectroscopic classification of AT 2026rdg=ZTF26abemjfk. I obtained its optical spectrum on 2026-07-02.85 UT with the Mookodi (Erasmus et al. ... Read more...

ATel 17867: Spectroscopy and photometry of AT 2026rdg, a highly reddened FeII...

2 Jul 2026 at 10:34pm
M. Ning and H. Lin, on behalf of the DCAP collaboration, reported to the TNS the discovery of the transient AT 2026rdg (= ZTF26abemjfk = DCAP 238) at g = 14.45 and r = 12.53 (AB mag) on 2026-07-01.305 UT. ... Read more...

ATel 17866: MAXI/GSC detection of an X-ray flare from UX Ari on 2026-06-25 UT

2 Jul 2026 at 3:43pm
At 00:26 on 2026-06-25 UT, the MAXI/GSC nova alert system triggered on a source at a position consistent with that of the RS CVn star UX Ari. The flux started to increase at 14:20 on 2026-06-24 UT, and peaked at 15:56 on 2026-06-26 UT, and decayed with an e-folding time of 1.2 days. ... Read more...

ATel 17857: Discovery of an Apparent Nova Positionally Coincident with G170 i...

28 Jun 2026 at 11:34am
We report the discovery of an apparent nova found during our survey of the central region of M31. The object was discovered on a co-added 1800-s H_alpha CMOS frame taken on 2026 Jun. ... Read more...

ATel 17850: EP260617a: optical observations with LCO

19 Jun 2026 at 2:37pm
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. ... Read more...

ATel 17846: Discovery of a Bright Probable Nova in M81, M81N 2026-06a

15 Jun 2026 at 8:45pm
We report the discovery of a bright probable nova in M81 on a co-added 5220-s unfiltered CMOS frame taken on 2026 Jun. 13.933 UT with the 0.65-m telescope at Ondrejov under poor seeing conditions. ... Read more...

ATel 17845: Spectroscopic Classification of Astrophysical Transients with the...

15 Jun 2026 at 5:58pm
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2026 June 15 UT. ... Read more...

ATel 17830: ALMA and MeerKAT detection of radio rebrightening of SN 2007it

4 Jun 2026 at 2:00pm
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. ... Read more...

ATel 17826: Discovery of a Probable Nova in M31, M31N 2026-06a

2 Jun 2026 at 2:24am
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. ... Read more...

ATel 17825: EP260530a/AT2026nwl: refined analysis of the EP-FXT observation

1 Jun 2026 at 8:50am
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. ... Read more...


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