RA/DEC (2000)
23:56:23.930 -31:21:11.50
359.099708 -31.353194
Type
SN Ia
Redshift
0.028563
Discovery ReportClassification Report
Reporting Group
BlackGEM
Discovering Data Source
BlackGEM
Discovery Date
2025-11-13 00:41:46.000
TNS AT
Y
Public
Y
Discovery Mag
18.16
Filter
BG-q-BlackGem
Reporter/s
H. Tranin, F. Stoppa, D. Pieterse, G. Ramsay, S. Faris, P. Groot, P. Vreeswijk, N. Blagorodnova, J. van Roestel, H. Wichern, S. Scaringi
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025adjc - 2025-11-18 12:56:05 FTS / FLOYDS-S (None)z=
▌Show H at z=vexp= km/s
▌Show He at z=vexp= km/s
▌Show He II at z=vexp= km/s
▌Show C II at z=vexp= km/s
▌Show C III at z=vexp= km/s
▌Show C IV at z=vexp= km/s
▌Show N II at z=vexp= km/s
▌Show N III at z=vexp= km/s
▌Show N IV at z=vexp= km/s
▌Show N V at z=vexp= km/s
▌Show O at z=vexp= km/s
▌Show [O I] at z=vexp= km/s
▌Show O II at z=vexp= km/s
▌Show [O II] at z=vexp= km/s
▌Show [O III] at z=vexp= km/s
▌Show O V at z=vexp= km/s
▌Show O VI at z=vexp= km/s
▌Show Na at z=vexp= km/s
▌Show Mg at z=vexp= km/s
▌Show Mg II at z=vexp= km/s
▌Show Si II at z=vexp= km/s
▌Show S II at z=vexp= km/s
▌Show Ca II at z=vexp= km/s
▌Show [Ca II] at z=vexp= km/s
▌Show Fe II at z=vexp= km/s
▌Show Fe III at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Å at z=vexp= km/s
▌Show Tellurics 
▌Show Galaxy lines at z=
▌Show WR-WN at z=vexp= km/s
▌Show WR-WC/O at z=vexp= km/s
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌BG4_BlackGEM-Cam4_BG-q
 ▌ML1_MeerLICHT-Cam_BG-q
   
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
22436 2025-11-18 12:56:05 FTS / FLOYDS-S 3600 Moira Andrews Moira Andrews None tns_AT_2025adjc_2025-11-18_12-56-05_FTS_FLOYDS-S_None.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
BG-q-BlackGem BG4_BlackGEM-Cam4 2025-11-13 00:41:46 - 2025-11-13 00:41:46 2460992.5290046 - 2460992.5290046 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
531019 2025-11-13 00:41:46 2460992.5290046 18.16 0.09 21.18 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic
BG-q-BlackGem ML1_MeerLICHT-Cam 2019-06-16 03:56:48 - 2019-06-16 03:56:48 2458650.6644444 - 2458650.6644444 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
531018 2019-06-16 03:56:48 2458650.6644444 19.54 ABMag BG-q-BlackGem ML1_MeerLICHT-Cam 60 robotic [Last non detection]
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
276726 2025-11-14 16:51:19 BlackGEM_Bot1 H. Tranin, F. Stoppa, D. Pieterse et al. BlackGEM BlackGEM 23:56:23.930 -31:21:11.50 2025-11-13 00:41:46.000 18.16 BG-q-BlackGem PSN BGEM J235623.93-312111.5 BlackGEM 2025TNSTR4571....1T N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22435 2025-11-20 09:41:23 Sara Faris Sara Faris (TAU), Hugo Tranin (UB), Moira Andrews(Las Cumbres), Iair Arcavi (TAU) None SN Ia 0.028563 1 Using SNID-SAGE (Stoppa et al., in prep.), we find that the heavily host-contaminated spectrum of AT 2025adjc is best matched by a late-phase Type Ia SN at the host galaxy redshift z = 0.028563 (from NED; da Costa et al. 1998, AJ, 116, 1), which is consistent with the observed narrow Ca II H&K absorption in the spectrum. 2025TNSCR4665....1F
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
22436 2025-11-18 12:56:05 FTS / FLOYDS-S 3600 Moira Andrews Moira Andrews None tns_AT_2025adjc_2025-11-18_12-56-05_FTS_FLOYDS-S_None.txt Object

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