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

ATel 17765: Addendum to ATel #17764: M31N 2026-04c is likely the third recurr...

25 Apr 2026 at 9:30pm
Comparison of the position of the newly discovered M31 nova candidate M31N 2026-04c (ATel #17764) with those of previously reported novae in M31 reveals that 2026-04c is very likely the third reported recurrence (fourth known eruption) of the recurrent nova M31N 1960-12a. ... Read more...

ATel 17764: Discovery of an Apparent Nova in M31, M31N 2026-04c

25 Apr 2026 at 8:29pm
We report the discovery of an apparent nova in M31 on a co-added 5400-s R-band CMOS frame taken on 2026 Apr. 24.042 UT with the 0.4-m telescope at Belec nad Orlici. ... Read more...

ATel 17762: Discovery of a Probable Nova in M31, M31N 2026-04b

23 Apr 2026 at 9:13pm
We report the discovery of a probable nova in M31 on a co-added 4200-s H_alpha CMOS frame taken on 2026 Apr. 23.056 UT with the 0.4-m telescope at Belec nad Orlici. ... Read more...

ATel 17761: XRISM/Xtend Transient Search (XTS) detected an X-ray flare possi...

23 Apr 2026 at 1:59pm
XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J0534-6855, on 2026-04-17 TT. The source position is determined to be (R.A., Dec.) = (83.396, -68.915) with a systematic error of & sim; 40 arcsec. ... Read more...

ATel 17757: Spectroscopic Classifications of Optical Transients with the Lick...

18 Apr 2026 at 11:26pm
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by the Legacy Survey of Space and Time (LSST) and the Zwicky Transient Facility (ZTF). ... Read more...

ATel 17750: Corrigendum to Atel #17748

11 Apr 2026 at 6:58pm
In ATel #17748 we announced the discovery of an apparent nova M31N 2026-04a. Unfortunately, the reported position of the nova was incorrect. The correct position of M31N 2026-04a is R.A. ... Read more...

ATel 17748: Discovery of an Apparent Nova in M31, M31N 2026-04a

10 Apr 2026 at 11:30pm
We report the discovery of an apparent nova in M31 on a co-added 2400-s H_alpha CMOS frame taken on 2026 Apr. 8.079 UT with the 0.4-m telescope at Belec nad Orlici. ... Read more...

ATel 17743: PRIME discovery and IRTF confirmation of a bright nova PRIME26aaa...

7 Apr 2026 at 3:49pm
We report the discovery and spectroscopic classification of a very bright NIR transient during the Galactic bulge survey carried out by the PRime-focus Infrared Microlensing Experiment (PRIME). ... Read more...

ATel 17738: Important brightening and a historical NIR maximum light of the B...

4 Apr 2026 at 5:40pm
We report on the recent NIR brightening of the intermediate redshift (z=0.593) radio quasar 3C345, cross correlated with the x-ray source 1ES1641+399, On March 27th, 2026 (JD 2461126.9535) we found the object on a historically NIR maximum light, for the lapse of almost 17 years covered by our NIR... Read more...

ATel 17737: Spectroscopic classification of the bright and nearby AT2026fhw w...

2 Apr 2026 at 11:19pm
We report spectroscopic observations of the nearby, bright transient AT2026fhw with OSMOS on the MDM 2.4 Hiltner telescope. The source was discovered by the ATLAS survey (Tonry et al., TNS Report No. ... Read more...


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