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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17543
Message-Id: <20251216070523.7A976288085A@server.astronomerstelegram.org>
Date: Tue, 16 Dec 2025 02:05:23 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17543							     ATEL #17543

Title:	Independent Discovery of an Apparent Nova in M31, AT 2025agwf
Author:	K. Hornoch (Ondrejov), H. Kucakova (Charles University), A.
		W. Shafter (SDSU), R. Fidrich (HAA/VSS)
Queries:	ashafter@sdsu.edu
Posted:	15 Dec 2025; 19:16 UT
Subjects:Optical, Nova, Transient

We report the independent discovery of an apparent nova found during our
survey of the central region of M31. The object was discovered on a co-added
360-s R-band CCD frame taken on 2025 Dec. 15.023 UT with the Danish 1.54-m
telescope at La Silla Observatory.

The object was independently discovered on Dec. 14.746 UT by F. Castellani
et al. and designated as AT 2025agwf = PNV J00431764+4114201 = Vend79.

The object was designated by us as M31N 2025-12c and is located at R.A.
= 0h43m17s.64, Decl. = +41o14'19".8 (equinox 2000.0), which is 375.7" east
and 108.7" south of the center of M31 (see link to discovery image below).

The following R-band magnitudes were obtained using the Danish 1.54-m telescope
(DK154):

<span class="inner-pre" style="font-size: 13px"> 
Date [UT]    |  Mag   | Err  | Filter  | Telescope

2025-12-13.025 | >19.8  |      | R       | DK154 
2025-12-15.023 |  16.34 | 0.03 | R       | DK154

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to confirm the nova's nature and determine its spectroscopic
class and rate of decline (speed class) are encouraged.

This work is based on data collected with the Danish 1.54-m telescope at
the ESO La Silla Observatory.

Discovery image: http://www.asu.cas.cz/~asteroid/M31N2025-12c.png
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