RA/DEC (2000)
00:43:17.625 +41:14:19.75
10.823436 +41.2388198
Type
Nova
Redshift
0
Discovery ReportClassification Report
Reporting Group
ISSP
Discovering Data Source
None
Discovery Date
2025-12-14 17:53:49.000
TNS AT
Y
Public
Y
Host Name
M31
Discovery Mag
17.5
Filter
Clear-
Reporter/s
Flavio Castellani
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌AT_2025agwf - 2025-12-20 19:31:00 BL41 / FOSC-E5535 (None)z=
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▌Show Mg at z=vexp= km/s
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),

Light curves

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌GOTO-N_GOTO-2_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌ATLAS-MLO_ATLAS-01_cyan
 ▌Other_Other_Clear
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
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
22650 2025-12-20 19:31:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2025agwf_2025-12-20_19-31-00_BL41_FOSC-E5535_None.dat tns_2025agwf_2025-12-20_19-31-00_BL41_FOSC-E5535_None.fit Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-12-18 21:43:18 - 2025-12-18 21:43:18 2461028.40507 - 2461028.40507 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
540984 2025-12-18 21:43:18 2461028.40507 19.77 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-2 2025-12-06 21:02:23 - 2025-12-20 20:27:54 2461016.376653 - 2461030.352713 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
541191 2025-12-20 20:27:54 2461030.352713 18.04 0.08 ABMag L-GOTO GOTO-N_GOTO-2 180
541190 2025-12-06 21:02:23 2461016.376653 18.8 ABMag L-GOTO GOTO-N_GOTO-2 135 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-12-15 03:49:21 - 2025-12-15 03:49:21 2461024.6592708 - 2461024.6592708 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539178 2025-12-15 03:49:21 2461024.6592708 16.4665 0.0418546 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2025-12-13 03:38:15 - 2025-12-15 02:44:07 2461022.6515625 - 2461024.6139699 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539177 2025-12-15 02:44:07 2461024.6139699 16.4964 0.037609 ABMag g-ZTF P48_ZTF-Cam
539176 2025-12-13 03:38:15 2461022.6515625 20.3588 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
cyan-ATLAS ATLAS-MLO_ATLAS-01 2025-12-20 06:58:07 - 2025-12-20 06:58:07 2461029.79036 - 2461029.79036 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
540985 2025-12-20 06:58:07 2461029.79036 18.403 0.111 19.72 ABMag cyan-ATLAS ATLAS-MLO_ATLAS-01 30 Robot
Clear- Other_Other 2025-12-14 17:29:26 - 2025-12-14 17:53:49 2461024.2287731 - 2461024.245706 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
538843 2025-12-14 17:53:49 2461024.245706 17.5 0.2 19.8 ABMag Clear- Other_Other 2700 CASTELLANI F. 0.40m f/7 Dall-Kirkham
538842 2025-12-14 17:29:26 2461024.2287731 19.8 ABMag Clear- Other_Other 2700 CASTELLANI F. [Last non detection] 0.40m f/7 Dall-Kirkham
AT Reports
ID Time received (UT) Sender Reporter/s Reporting group Disc. Data Source RA DEC Discovery date (UT) Discovery Mag. Filter Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks ADS Bibcode Unreal Auto classification
281668 2025-12-20 21:50:10 GOTO_bot G. Ramsay,D. O'Neill,K. Ackley et al. GOTO GOTO 00:43:17.630 +41:14:19.48 2025-12-20 20:27:54.144 18.04 L-GOTO Other GOTO25mfb GOTO N
281574 2025-12-20 11:45:40 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland (IfA et al. ATLAS ATLAS 00:43:17.657 +41:14:19.59 2025-12-20 06:58:07.104 18.403 cyan-ATLAS PSN ATLAS25pyt ATLAS N
280751 2025-12-15 16:03:25 Fritz Daniel Perley (LJMU),Christoffer Fremling (Caltech),Theophile du Laz (Caltech) on behalf of ZTF et al. ZTF ZTF 00:43:17.625 +41:14:19.75 2025-12-15 02:44:06.999 16.4964 g-ZTF PSN ZTF25achqkvb ZTF N
280577 2025-12-14 19:31:19 Raffaele Belligoli Flavio Castellani et al. ISSP 00:43:17.640 +41:14:20.10 2025-12-14 17:53:49.000 17.5 Clear- PNV M31 Flavio Castellani report the discovery by F.Castellani, R.Belligoli and V.Andreoli of a PNV (Mag. 17.5R +-0.20 - USNOB1 catalogue) in the host galaxy M31 at Monte Baldo Observatory, Ferrara di Monte Baldo, Verona, Italy (A99), in the course of Italian Supernovae Search Project using a 0.40m f/7 Dall-Kirkham telescope (+ Moravian G4-9000 KAF unfiltered CCD camera)15*180 co-added images. No stellar source was visible at the position of the transient in our past images including reference image dated 2025/12/13 17:29:26. 2025TNSTR4968....1C N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22649 2025-12-20 19:55:04 Claudio Balcon Claudio Balcon (Belluno A.O. ISSP) None Nova 0 1 The spectrum resembles that of a Nova in M31. 2025TNSCR5094....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
22650 2025-12-20 19:31:00 BL41 / FOSC-E5535 1800 Claudio Balcon Claudio Balcon None tns_2025agwf_2025-12-20_19-31-00_BL41_FOSC-E5535_None.dat tns_2025agwf_2025-12-20_19-31-00_BL41_FOSC-E5535_None.fit Object

Comments

TNS
System

Mon, 12/15/2025 - 16:03

Object coordinates updated

Object coordinates updated according to AT-report 280751 of Group ZTF
Previous RA, DEC: 00:43:17.640, +41:14:20.10 (10.8235, +41.238917)
Updated RA, DEC: 00:43:17.625, +41:14:19.75 (10.823436, +41.2388198)

Katsumi
Yoshimoto

Mon, 12/15/2025 - 14:28

Follow-up photometry

2025-12-15 09:46:24,  Vmag = 16.47, using 0.30-m f/4.0 reflector + V filter CMOS.