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

ATel 17199: Independent Discovery of a Probable Nova in M31 and a Prediscover...

21 May 2025 at 7:30pm
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 990-s R-band CCD frame taken on 2025 May 21.028 UT with the 0.65-m telescope. ... Read more...

ATel 17196: ASASSN-25bv: Two Recent, Deep Dimming Events

20 May 2025 at 2:46pm
Using data from the All-Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017, Hart et al. 2023 ) we found a star with two deep dimming events. ... Read more...

ATel 17182: M31N 2025-02b is a Recurrence of the Newly-Identified Recurrent N...

14 May 2025 at 5:49am
A comparison of the position of M31N 2025-02b (AT2025axv), discovered on 2025 Feb. 05.471 by K. Itagaki, has revealed that it is spatially coincident within ~1.1 arcsec with the published position of a previously identified nova, M31N 2001-11a (ShA 67), reported by Alksnis et al. ... Read more...

ATel 17178: Independent Discovery of a Probable Nova in M31

9 May 2025 at 6:23pm
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 900-s R-band CCD frame taken on 2025 May 9.089 UT with the 0.65-m telescope at Ondrejov under poor observing conditions. ... Read more...

ATel 17176: Spectroscopic Classification of Astrophysical Transients with the...

8 May 2025 at 8:40pm
We report the following classification from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 April 21 UT. The targets were supplied by ATLAS and ZTF (through both the ALeRCE and Fritz data streams). ... Read more...

ATel 17169: Spectroscopic Classification of Astrophysical Transients with the...

7 May 2025 at 12:41am
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 May 06 UT. ... Read more...

ATel 17165: e-MERLIN non-detection of supernova SN2025gvs in UGC10058

30 Apr 2025 at 11:27am
Supernova SN2025gvs was first reported on 05/04/2025 on the Transient Name Server, TNS#251047. Located at RA=15:50:23.398 Dec=+25:55:10.03, and classified on 06/04/2025 as a type II, with early similarities to type IIb or type IIP. ... Read more...

ATel 17164: 4U 1630-47 in an unusually radio-bright state

29 Apr 2025 at 4:42pm
The black hole transient 4U 1630-47 started a new outburst on MJD 60768. Data from the Swift (XRT+BAT) instrument taken between the 6th and the 7th of April showed that the source was in the hard state, which has been rarely observed in this source (ATel #17139). ... Read more...

ATel 17161: Spectroscopic Classification of Astrophysical Transients with the...

24 Apr 2025 at 9:07pm
We report the classifications of astrophysical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope obtained on 2025 April 09 UT. ... Read more...

ATel 17158: Discovery of a Probable Nova in M31

21 Apr 2025 at 7:31pm
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 2025 Apr. ... Read more...


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