2025aapj | Transient Name Server

RA/DEC (2000)

00:40:06.064 +40:48:54.96

10.0252678 +40.8152654

Type

Nova

Redshift

0

Discovery Report Classification Report

Reporting Group

ULL-ASTRO-MASTER

Discovering Data Source

ULL-ASTRO-MASTER

Discovery Date

2025-10-16 07:14:35.000

TNS AT

Y

Public

Y

Host Name

M31

Discovery Mag

17.88

Filter

g-Sloan

Reporter/s

E. Mejía-Martínez, J. Basurto Merino, P.G. Berdayes, A. Caballero-Almagro, A. Cerón, M. Contreras, F. Díaz-Segado, T. Ferrer-Laviña, B. Gandolfi, V. Ghiraldo, J. Hernández Fung, L. Juliá-Maroto, E. Lekaroz-Urriza, M. Manzano García, J. Prieto Polo, M. Pulido-Torres, M. Quintana-Ansaldo, A. Schenone-Zanuzzi, A. Selezneva, T. Tundidor Rodríguez, E. Urquijo-Rodríguez (all ULL), M. Abdul-Masih (IAC and ULL), and I. Pérez-Fournon (IAC and ULL)

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	End prop. period	Remarks
	22310	2025-10-24 20:22:25	Other / Other	5400	E Soubrouillard	E soubrouillard	None	tns_2025aapj_2025-10-24_20-22-25_Other_Other_None.dat	tns_2025aapj_2025-10-24_20-22-25_Other_Other_None.fits	Object	2025-10-27	Spectrum taken using an Alpy200 grism slit spectrograph (R~130) dedicated for SN classification and a 0.3 Newton telescope in Pic des Fées Observatory - France
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks Spectrum taken using an Alpy200 grism slit spectrograph (R~130) dedicated for SN classification and a 0.3 Newton telescope in Pic des Fées Observatory - France
	22229	2025-10-16 22:09:16	Other / Other	9010	Etienne Bertrand	Etienne Bertrand	None	tns_2025aapj_2460965.4231_Other_Other_None.dat	tns_2025aapj_2460965.4231_Other_Other_None.fit			C11 telescope, x0.67 reducter, spectrographe ALPY600, resolution 480, ISIS spectro software 5 x 1800s exposures
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks C11 telescope, x0.67 reducter, spectrographe ALPY600, resolution 480, ISIS spectro software 5 x 1800s exposures

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

L-GOTO

GOTO-N_GOTO-2

2025-10-20 23:01:27 - 2025-10-20 23:01:27

2460969.459344 - 2460969.459344

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
525528	2025-10-20 23:01:27	2460969.459344	17.77	0.03		ABMag	L-GOTO	GOTO-N_GOTO-2	180

L-GOTO

GOTO-N_GOTO-1

2025-10-12 02:46:50 - 2025-10-12 02:46:50

2460960.615862 - 2460960.615862

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
525527	2025-10-12 02:46:50	2460960.615862			20	ABMag	L-GOTO	GOTO-N_GOTO-1	360		[Last non detection]

r-ZTF

P48_ZTF-Cam

2025-10-12 08:35:36 - 2025-10-18 04:39:09

2460960.8580556 - 2460966.6938542

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524528	2025-10-18 04:39:09	2460966.6938542	17.0887	0.0370349		ABMag	r-ZTF	P48_ZTF-Cam
524526	2025-10-12 08:35:36	2460960.8580556			20.7228	ABMag	r-ZTF	P48_ZTF-Cam			[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-10-16 08:35:43 - 2025-10-16 08:35:43

2460964.8581366 - 2460964.8581366

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524527	2025-10-16 08:35:43	2460964.8581366	18.023	0.0339655		ABMag	g-ZTF	P48_ZTF-Cam

g-Sloan

Other_Other

2025-10-16 07:14:35 - 2025-10-16 07:14:35

2460964.801794 - 2460964.801794

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
524243	2025-10-16 07:14:35	2460964.801794	17.88	0.08		ABMag	g-Sloan	Other_Other	180	LCObot	Nova candidate in M31 discovered with LCO 40-cm telescope at McDonald Observatory.

Other-

Other_Other

2015-01-19 12:14:16 - 2025-10-28 19:21:30

2457042.00991 - 2460977.3066

9

Photometry

ID	Obs-date	JD	Mag. / Flux	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
527510	2025-10-28 19:21:30	2460977.3066	19.2	19.3	VegaMag	Other-	Other_Other	60	Robot	MASTER-Tunka
527509	2025-10-28 19:20:17	2460977.30575	18.6	19.6	VegaMag	Other-	Other_Other	60	Robot	MASTER-Tunka
526310	2025-10-23 19:50:11	2460972.32652	17.7	18.1	VegaMag	Other-	Other_Other	60	Robot	MASTER-Tunka
526309	2025-10-23 19:37:58	2460972.31803	17.7	18.3	VegaMag	Other-	Other_Other	60	Robot	MASTER-Tunka
525273	2025-10-19 19:46:52	2460968.32421	17.4	19.2	VegaMag	Other-	Other_Other	180	Robot	MASTER-Kislovodsk
525272	2025-10-19 19:43:32	2460968.3219	17.4	19.2	VegaMag	Other-	Other_Other	180	Robot	MASTER-Kislovodsk
527508	2025-09-18 18:53:24	2460937.28708		20.9	VegaMag	Other-	Other_Other	180	Robot	[Last non detection] MASTER-Tunka
525271	2016-10-04 20:41:09	2457666.36191		21.3	VegaMag	Other-	Other_Other	540	Robot	[Last non detection] MASTER-Kislovodsk
526308	2015-01-19 12:14:16	2457042.00991		18.8	VegaMag	Other-	Other_Other	540	Robot	[Last non detection] MASTER-Tunka

AT Reports

ID	Time received (UT)	Sender	Reporter/s	Reporting group	Disc. Data Source	RA	DEC	Discovery date (UT)	Discovery Mag.	Filter	AT Type	Host name	Internal name	Assoc. Groups	Remarks	ADS Bibcode	Unreal
275085	2025-10-28 20:22:12	MASTER	K.Vetrov, V.Lipunov, E.Gorbovskoy et al.	MASTER	MASTER	00:40:06.050	+40:48:53.20	2025-10-28 19:20:16.800	18.6	Other-	Other		MASTER OT J004006.05+404853.2	MASTER	unfiltered		N
274556	2025-10-23 20:54:21	MASTER	O.Gress, V.Lipunov, E.Gorbovskoy et al.	MASTER	MASTER	00:40:05.990	+40:48:55.30	2025-10-23 19:37:57.792	17.7	Other-	Other		MASTER OT J004005.99+404855.3	MASTER	I filter(Johnson/Bessel)		N
274211	2025-10-21 12:47:47	GOTO_bot	G. Ramsay, D. O'Neill, K. Ackley et al.	GOTO	GOTO	00:40:06.065	+40:48:54.85	2025-10-20 23:01:26.976	17.77	L-GOTO	Other		GOTO25ivy	GOTO			N
274095	2025-10-20 18:30:56	MASTER	Ya.Kechin, V.Lipunov, E.Gorbovskoy et al.	MASTER	MASTER	00:40:06.110	+40:48:54.70	2025-10-19 19:43:32.160	17.4	Other-	PNV		MASTER OT J004006.11+404854.7	MASTER			N
273753	2025-10-18 05:19:36	BTSbot_bot	Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), Theophile du Laz (Caltech) on behalf of ZTF	ZTF	ZTF	00:40:06.064	+40:48:54.96	2025-10-16 08:35:43.002	18.023	g-ZTF	PSN		ZTF25abxdetz	ZTF	Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).		N
273560	2025-10-16 13:35:21	Ismael Perez-Fournon	E. Mejía-Martínez, J. Basurto Merino, P.G. Berdayes et al.	ULL-ASTRO-MASTER	ULL-ASTRO-MASTER	00:40:06.077	+40:48:55.03	2025-10-16 07:14:35.000	17.88	g-Sloan	PNV	M31	ULL-ASTRO-MASTER-7	ULL-ASTRO-MASTER	Nova candidate in M31 discovered with LCO 40-cm telescope at McDonald Observatory	2025TNSTR4146....1M	N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

22310

2025-10-27 21:32:51

EMMANUEL SOUBROUILLARD

Emmanuel Soubrouillard

None

Nova

0

1

2025-10-27

The spectrum shows strong Balmer and Fe II emission lines, including H α (λ6563 Å), H β (λ4861 Å), and Fe II multiplets at 4924, 5018, 5169, 5316 Å. No significant redshift is measured (z ≈ 0), confirming a probable M31 origin. The overall spectrum and line velocities are consistent with a classical nova of the Fe II subtype, observed near maximum or during early decline.

2025TNSCR4338....1S

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2025aapj_atrep_22310.png	2D spectrum	2025-10-27 21:32:51	EMMANUEL SOUBROUILLARD

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
22310	2025-10-24 20:22:25	Other / Other	5400	E Soubrouillard	E soubrouillard	None	tns_2025aapj_2025-10-24_20-22-25_Other_Other_None.dat	tns_2025aapj_2025-10-24_20-22-25_Other_Other_None.fits	Object		2025-10-27	Spectrum taken using an Alpy200 grism slit spectrograph (R~130) dedicated for SN classification and a 0.3 Newton telescope in Pic des Fées Observatory - France

22229

2025-10-17 11:21:15

Etienne Bertrand

None

Nova

-0.00167

1

2025-10-17

Possible Nova, a émission line in H alpha with redshift -0.00167 like redshift of M31 (-0.001). (observation who requests a professional classification, because some noise in spectra).

2025TNSCR4179....1B

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
22229	2025-10-16 22:09:16	Other / Other	9010	Etienne Bertrand	Etienne Bertrand	None	tns_2025aapj_2460965.4231_Other_Other_None.dat	tns_2025aapj_2460965.4231_Other_Other_None.fit				C11 telescope, x0.67 reducter, spectrographe ALPY600, resolution 480, ISIS spectro software 5 x 1800s exposures

Comments

ULL-ASTRO-MASTER-7 (AT 2025aapj), M31 nova

ULL-ASTRO-MASTER-7 (AT 2025aapj), M31 nova

LCO 40-cm telescope at LCO node at McDonald Observatory, Texas.

SDSS g', 180 sec

2025-10-16 07:14:35

E. Mejía-Martínez et al. (TNS Astronomical Transient Report No. 273560)

M31_nova_ULL-ASTRO-MASTER-7_AT_2025aapj.png

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Object coordinates updated

Object coordinates updated according to AT-report 273753 of Group ZTF
Previous RA, DEC: 00:40:06.077, +40:48:55.03 (10.025321, +40.815286)
Updated RA, DEC: 00:40:06.064, +40:48:54.96 (10.0252678, +40.8152654)

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