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From: atel@astronomerstelegram.org
Subject: ATel  17285, 17286
Message-Id: <20250715071023.EEEBC2880141@server.astronomerstelegram.org>
Date: Tue, 15 Jul 2025 03:10:23 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17285							     ATEL #17285

Title:	Follow-up observations of AT 2025qmf, a possible nova in M31
Author:	R. Fidrich (HAA/VSS, Budakeszi, Hungary), A. S. Vinokurov
		(SAO RAS), T. Tordai (HAA/VSS, Budapest, Hungary), O. I. Spiridonova
		(SAO RAS)
Queries:	vinokurov@sao.ru
Posted:	14 Jul 2025; 11:11 UT
Subjects:Optical, Nova, Transient

We present the results of optical photometry of AT 2025qmf discovered by
Robert Fidrich in the field of M31 on 2025 July 6.34904UT near 17.70 magnitude.

Over the past week AT 2025qmf dimmed gradually almost by 2 magnitudes.
The B-V and V-R color indices of AT 2025qmf (0.62 and 0.52, respectively)
suggest that the transient is unlikely to be a cataclysmic variable or
a long-period variable.

Observations were made with the 0.51m CDK reflector (iTelescope.net network),
Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah,
USA (T26 the table below), the 0.43m CDK reflector, Alnitak Remote Observatory
at Nerpio, Spain (A1) and the 1m Zeiss-1000 telescope at SAO RAS (Z1).

JD-2460000 | Mag  | Filter | Telescope

862.85     | 17.706  &plusmn; 0.029 |  LV   |   T26   
864.58     | 18.09   &plusmn; 0.05  |  LV   |   A1   
864.60     | 17.58   &plusmn; 0.05  |  R    |   A1   
865.52     | 19.29   &plusmn; 0.07  |  B    |   Z1   
865.52     | 18.67   &plusmn; 0.03  |  V    |   Z1   
865.87     | 18.87   &plusmn; 0.10  |  LV   |   T26   
866.64     | 19.02   &plusmn; 0.11  |  V    |   A1   
866.64     | 18.50   &plusmn; 0.11  |  R    |   A1   
867.86     | 19.07   &plusmn; 0.14  |  LV   |   T26   
868.90     | 19.67   &plusmn; 0.22  |  LV   |   T26

Filter key: Johnson filters B, V and R; LV refer to Luminance filter, calibrated
using V comparison stars.

Spectroscopy and additional photometric observations (especially with H-alpha
and Johnson or Cousins R-band) of this nova candidate in M31 are strongly
encouraged to confirm the nature of this transient.

The observations made using the Alnitak Remote Observatories robotic telescope
network, were supported by ARTA program. The Zeiss-1000 observations and
calibrations were performed as part of the government contract of the SAO
RAS approved by the Ministry of Science and Higher Education of the Russian
Federation. Observations with the SAO RAS telescopes are supported by the
Ministry of Science and Higher Education of the Russian Federation. The
renovation of telescope equipment is currently provided within the national
project "Science and Universities".

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Password Certification: Alexander Vinokurov (vinokurov@sao.ru)
https://www.astronomerstelegram.org/?read=17285
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ATEL #17286							     ATEL #17286

Title:	Spectroscopic Classification of an Optical Transient with the
		Lick Shane telescope
Author:	Kishore C. Patra,  Ryan J. Foley (UCSC)
Queries:	kcpatra@ucsc.edu
Posted:	14 Jul 2025; 22:45 UT
Subjects:Optical, Supernovae, Transient

We report the following classification of an optical transient from spectroscopic
observations with the Kast spectrograph on the Shane telescope. The target
was supplied by ATLAS. Observations were made on 2025 July 03 UT. Classification
was performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

Name        	| IAU Name  	| RA (J2000)	| Dec (J2000)	|   z	| Type	   |
Phase	| Notes 
ATLAS25gku	| AT2025orm 	| 13:54:08.77   | +24:08:00.49  | 0.056	| Ia-91bg
| 16 d	| (1)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum.  Otherwise, the redshift is determined from the host galaxy.

(1) The spectrum is highly contaminated by galaxy light.  SNID template
fitting was performed after subtracting an SDSS host-galaxy template spectrum.
The best-fit match was SN 1991bg at +16 days past peak brightness. The
transient exhibits a red color at peak, an absolute B-band magnitude of
approximately -18.4 mag, and a fast decline rate of Delta m15 (B) ~ 1.4
mag, all of which support a SN 1991bg-like subclassification.

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Password Certification: Kishore Patra (kcpatra@ucsc.edu)
https://www.astronomerstelegram.org/?read=17286
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