RA/DEC (2000)
12:27:13.976 +08:28:56.69
186.808233 +8.482413
Type
SN IIn
Redshift
0.177
Discovery ReportClassification Report
Related AstroNotes: 2026-89, 2026-92
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2025-11-29 05:25:08.256
TNS AT
Y
Public
Y
Discovery Mag
19.6
Filter
L-GOTO
Reporter/s
D. O'Neill, K. Ackley, M. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, R. Starling, B. Gompertz, B. Godson, T. Killestein, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025ahkl - 2026-03-23 06:43:00 Magellan-Clay / LDSS-3 (FLEET)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

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌Rubin_LSSTCam_i
 ▌GOTO-N_GOTO-2_L
 ▌PS2_GPC2_w
 ▌ATLAS-HKO_ATLAS-02_orange
 ▌PS1_GPC1_r
   
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
23408 2026-03-23 06:43:00 Magellan-Clay / LDSS-3 Yuri Beletsky Harsh Kumar FLEET tns_2025ahkl_2026-03-23_06-43-00_Magellan-Clay_LDSS-3_FLEET.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2025-12-23 04:49:02 - 2025-12-23 04:49:02 2461032.70072 - 2461032.70072 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
542829 2025-12-23 04:49:02 2461032.70072 19.7 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot [Last non detection]
i-LSST Rubin_LSSTCam 2026-02-20 05:39:04 - 2026-02-20 05:39:04 2461091.735463 - 2461091.735463 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
561392 2026-02-20 05:39:04 2461091.735463 19.48 0.01 ABMag i-LSST Rubin_LSSTCam
L-GOTO GOTO-N_GOTO-2 2025-06-26 21:49:36 - 2025-11-29 05:25:08 2460853.409447 - 2461008.725791 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
540091 2025-11-29 05:25:08 2461008.725791 19.6 0.18 ABMag L-GOTO GOTO-N_GOTO-2 180
540090 2025-06-26 21:49:36 2460853.409447 19.5 ABMag L-GOTO GOTO-N_GOTO-2 180 [Last non detection]
w-P1 PS2_GPC2 2026-01-17 12:45:28 - 2026-01-17 12:45:28 2461058.03157 - 2461058.03157 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
572691 2026-01-17 12:45:28 2461058.03157 19.62 0.06 22 ABMag w-P1 PS2_GPC2 45 Robot
orange-ATLAS ATLAS-HKO_ATLAS-02 2025-12-26 13:38:28 - 2025-12-26 13:38:28 2461036.06838 - 2461036.06838 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
542830 2025-12-26 13:38:28 2461036.06838 19.342 0.17 19.4 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
r-P1 PS1_GPC1 2025-12-31 15:04:52 - 2025-12-31 15:04:52 2461041.12838 - 2461041.12838 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
546999 2025-12-31 15:04:52 2461041.12838 19.45 0.11 20.6 ABMag r-P1 PS1_GPC1 27 Robot
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
298775 2026-04-06 08:17:31 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 12:27:13.976 +08:28:56.72 2026-01-17 12:45:27.648 19.62 w-P1 PSN PS25mpc Pan-STARRS N
292864 2026-02-25 02:37:44 K-Ryan Hinds Mansi Kasliwal (Caltech), Michael Coughlin (UMN), Theophile Jegou du Laz (Caltech) et al. ZTF Rubin 12:27:13.976 +08:28:56.69 2026-02-06 00:00:00.000 19.48 i-LSST PSN LSST-P-DO-170028526873870371 Rubin, ZTF Found using Babamul (https://babamul.caltech.edu). BOOM/Babamul is funded by the National Science Foundation under award # 2432476. N
285673 2026-01-02 17:59:33 YSE_Bot1 D. O. Jones (UC Santa Cruz), K. D. French (Carnegie, Illinois), A. Agnello et al. YSE Pan-STARRS 12:27:13.978 +08:28:56.70 2025-12-31 15:04:52.032 19.45 r-P1 PSN PS25mpc Pan-STARRS N
282441 2025-12-26 22:02:58 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 12:27:13.976 +08:28:56.45 2025-12-26 13:38:28.032 19.342 orange-ATLAS PSN ATLAS25qgv ATLAS N
281151 2025-12-18 09:27:53 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 12:27:14.049 +08:28:56.93 2025-11-29 05:25:08.256 19.6 L-GOTO Other GOTO25lvz GOTO 2025TNSTR5034....1O N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
23406 2026-03-31 20:39:11 Peter Blanchard Peter Blanchard (Harvard/CfA), Harsh Kumar (Harvard/CfA), Edo Berger (Harvard/CfA), Sebastian Gomez (UT Austin), Daichi Hiramatsu (Univ. of Florida) FLEET SN IIn 0.177 1 FLEET 2026TNSCR1380....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
23408 2026-03-23 06:43:00 Magellan-Clay / LDSS-3 Yuri Beletsky Harsh Kumar FLEET tns_2025ahkl_2026-03-23_06-43-00_Magellan-Clay_LDSS-3_FLEET.ascii Object

Comments

TNS
System

Wed, 02/25/2026 - 02:37

Object coordinates updated

Object coordinates updated according to AT-report 292864 of Group Rubin
Previous RA, DEC: 12:27:13.978, +08:28:56.70 (186.80824032, +8.48241664178)
Updated RA, DEC: 12:27:13.976, +08:28:56.69 (186.808233, +8.482413)

TNS
System

Fri, 01/02/2026 - 17:59

Object coordinates updated

Object coordinates updated according to AT-report 285673 of Group Pan-STARRS
Previous RA, DEC: 12:27:13.976, +08:28:56.45 (186.808234, +8.482348)
Updated RA, DEC: 12:27:13.978, +08:28:56.70 (186.80824032, +8.48241664178)

TNS
System

Fri, 12/26/2025 - 22:02

Object coordinates updated

Object coordinates updated according to AT-report 282441 of Group ATLAS
Previous RA, DEC: 12:27:14.049, +08:28:56.93 (186.808539, +8.482481)
Updated RA, DEC: 12:27:13.976, +08:28:56.45 (186.808234, +8.482348)