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

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...

ATel 17813: ASASSN-26no is a new Galactic classical nova in Musca

26 May 2026 at 2:43am
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. ... Read more...

ATel 17811: XRISM/Xtend Transient Search (XTS) detected a flare or outburst f...

25 May 2026 at 7:24am
XRISM/Xtend Transient Search (XTS) detected a new X-ray transient source candidate XRISM J2326+5843 on an observation during 2026-05-23 to 2026-05-24 TT, whose exposure is 47 ks. ... Read more...

ATel 17810: Discovery of a Possible Symbiotic Nova in M31, M31N 2022-10c

22 May 2026 at 6:49pm
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). ... Read more...

ATel 17807: Discovery of a Probable Nova in M81, M81N 2026-05a

19 May 2026 at 7:27pm
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. ... Read more...

ATel 17806: Correction to ATel 17805

19 May 2026 at 9:32am
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. Read more...

ATel 17805: Spectroscopy of the Nova AT2026clk obtained in France

18 May 2026 at 12:05pm
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. ... Read more...

ATel 17804: Identification and spectroscopic classification of a reddened cla...

15 May 2026 at 6:04pm
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. ... Read more...


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