RA/DEC (2000)
04:55:26.089 -53:09:43.44
73.858704 -53.162067
Type
SN Ia
Redshift
0.145
Discovery ReportClassification Report
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2025-11-12 16:15:29.088
TNS AT
Y
Public
Y
Discovery Mag
19.7
Filter
L-GOTO
Reporter/s
K. Ackley, G. Ramsay, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, T. Killestein, A. Kumar, D. O'Neill, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025addc - 2025-11-14 00:00:00 SALT / RSS (GW-MMADS)z=
 ▌SN_2025addc - 2025-11-13 21:12:58 SALT / RSS (BlackGEM)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

 ▌GOTO-S_GOTO-4_L
 ▌GOTO-S_GOTO-3_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌ATLAS-CHL_ATLAS-04_cyan
 ▌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
22411 2025-11-14 00:00:00 SALT / RSS SALT Observer Tomas Cabrera GW-MMADS tns_2025addc_2025-11-14_SALT_RSS_GW-MMADS.txt Object
22420 2025-11-13 21:12:58 SALT / RSS 2000 SALT Simon de Wet BlackGEM tns_2025addc_2025-11-13_21-12-58_SALT_RSS_BlackGEM.txt Object We triggered observations with SALT/RSS using the PG0700 grating through the SALT GW follow-up programme.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2025-10-22 14:45:09 - 2025-10-22 14:45:09 2460971.114693 - 2460971.114693 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530661 2025-10-22 14:45:09 2460971.114693 19.4 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
L-GOTO GOTO-S_GOTO-3 2025-11-12 16:15:29 - 2025-11-12 16:15:29 2460992.177419 - 2460992.177419 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530662 2025-11-12 16:15:29 2460992.177419 19.7 0.18 ABMag L-GOTO GOTO-S_GOTO-3 240
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-11-13 07:21:54 - 2025-11-13 07:21:54 2460992.80687 - 2460992.80687 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530846 2025-11-13 07:21:54 2460992.80687 19.712 0.158 19.89 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 110 Robot
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-11-12 05:11:14 - 2025-11-12 05:11:14 2460991.71613 - 2460991.71613 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530845 2025-11-12 05:11:14 2460991.71613 19.42 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
BG-q-BlackGem BG4_BlackGEM-Cam4 2025-11-13 02:05:06 - 2025-11-13 02:05:06 2460992.586875 - 2460992.586875 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530804 2025-11-13 02:05:06 2460992.586875 19.82 0.16 20.76 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic
BG-q-BlackGem ML1_MeerLICHT-Cam 2020-04-23 23:46:54 - 2020-04-23 23:46:54 2458963.4909028 - 2458963.4909028 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
530803 2020-04-23 23:46:54 2458963.4909028 20.5 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
276647 2025-11-13 12:23:55 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 04:55:26.097 -53:09:42.95 2025-11-13 07:21:53.568 19.712 orange-ATLAS PSN ATLAS25ofj ATLAS N
276629 2025-11-13 10:02:02 BlackGEM_Bot1 H. Tranin,F. Stoppa,D. Pieterse et al. BlackGEM BlackGEM 04:55:26.089 -53:09:43.44 2025-11-13 02:05:06.000 19.82 BG-q-BlackGem 1 PSN BGEM J045526.09-530943.4 BlackGEM N
Related files
File Comments Last Modified (UT) Modified By
tns_2025addc_atrep_276629.pdf 2025-11-13 10:28:18 BlackGEM_Bot1
276506 2025-11-12 19:40:59 GOTO_bot K. Ackley,G. Ramsay,M. Dyer et al. GOTO GOTO 04:55:26.135 -53:09:43.61 2025-11-12 16:15:29.088 19.7 L-GOTO Other GOTO25jyg GOTO 2025TNSTR4540....1A N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22419 2025-11-17 10:06:53 Simon de Wet Simon de Wet BlackGEM SN Ia 0.145 1 BlackGEM SNID-SAGE finds close matches to SN Ia spectra at z=0.145. 2025TNSCR4626....1d
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
22420 2025-11-13 21:12:58 SALT / RSS 2000 SALT Simon de Wet BlackGEM tns_2025addc_2025-11-13_21-12-58_SALT_RSS_BlackGEM.txt Object We triggered observations with SALT/RSS using the PG0700 grating through the SALT GW follow-up programme.
22410 2025-11-14 20:15:46 Xander Hall Xander J. Hall (CMU), Tomás Cabrera (CMU), Lei Hu (CMU), Antonella Palmese (CMU), Igor Andreoni (UNC), Keerthi Kunnumkai (CMU), Brendan O’Connor (CMU), on behalf of the Gravitational Wave MultiMessenger Astronomy DECam Survey (GW-MMADS) team GW-MMADS SN Ia 0.1468 1 1 GW-MMADS NGSF best match is to a Ia-norm 2011by 2025TNSCR4585....1H
Related files
File Comments Last Modified (UT) Modified By
tns_2025addc_atrep_22410_GW-MMADS.png 2025-11-14 20:15:46 Xander Hall
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
22411 2025-11-14 00:00:00 SALT / RSS SALT Observer Tomas Cabrera GW-MMADS tns_2025addc_2025-11-14_SALT_RSS_GW-MMADS.txt Object

Comments

TNS
System

Thu, 11/13/2025 - 10:02

Object coordinates updated

Object coordinates updated according to AT-report 276629 of Group BlackGEM
Previous RA, DEC: 04:55:26.135, -53:09:43.61 (73.858894, -53.162114)
Updated RA, DEC: 04:55:26.089, -53:09:43.44 (73.858704, -53.162067)