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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17542
Message-Id: <20251215070528.42AB42880799@server.astronomerstelegram.org>
Date: Mon, 15 Dec 2025 02:05:28 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17542							     ATEL #17542

Title:	Photometry of M31 Nova AT 2025agmm
Author:	C. Gobat, K. J. Casciotti, J. C. Horst, R. M. Quimby, A. W.
		Shafter (SDSU), K. Hornoch (Ondrejov), H. Kucakova (Charles University),
		R. Fidrich, T. Tordai (HAA/VSS)
Queries:	ashafter@sdsu.edu
Posted:	14 Dec 2025; 21:25 UT
Subjects:Optical, Nova, Transient

We report multi-color photometry of the M31 nova AT 2025agmm (= PNV J00421476+4117284,
Vend78) discovered by R. Fidrich on 2025 Dec 11.776 UT. Our follow-up observations
of the nova, which is designated by us as M31N 2025-12b, were taken with
the Mount Laguna Observatory 40-in reflector and the Danish 1.54-m telescope
at La Silla, and are given below.

2025 Dec. 13.025 |  6x60s   | 16.83 | 0.03 |   R    | 1.54-m 
2025 Dec. 13.299 |  3x180s  | 16.97 | 0.13 |   B    | 40-in 
2025 Dec. 13.307 |  4x180s  | 16.90 | 0.17 |   V    | 40-in 
2025 Dec. 13.298 |  4x180s  | 16.65 | 0.04 |   R    | 40-in

</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.

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