RA/DEC (2000)
15:54:55.850 -08:07:38.26
238.7327104 -8.1272952
Type
SN IIn
Redshift
0.035
Discovery ReportClassification Report
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2026-03-18 10:06:57.997
TNS AT
Y
Public
Y
Discovery Mag
19.9956
Filter
r-ZTF
Reporter/s
Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026hiw - 2026-06-11 00:00:00 Magellan-Clay / LDSS-3 (FLEET)z=
 ▌SN_2026hiw - 2026-06-11 00:00:00 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
z-step:   v-step: 
   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ▌GOTO-S_GOTO-3_L
 ▌ATLAS-CHL_ATLAS-04_cyan
 ▌GOTO-N_GOTO-1_L
 ▌BG4_BlackGEM-Cam4_BG-q
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌P48_ZTF-Cam_r
 ▌ATLAS-MLO_ATLAS-01_orange
   
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
24320 2026-06-11 00:00:00 Magellan-Clay / LDSS-3 Harsh Kumar (Harvard CfA), Peter Blanchard (Harvard CfA) FLEET tns_2026hiw_2026-06-11_00-00-00_Magellan-Clay_LDSS-3_FLEET.ascii Object
24156 2026-06-11 00:00:00 Magellan-Clay / LDSS-3 Harsh Kumar (Harvard CfA), Peter Blanchard (Harvard CfA), Daichi Hiramatsu (UF), Alex Gagliano (CfA) Harsh Kumar (Harvard CfA) FLEET tns_2026hiw_2026-06-11.000_Magellan-Clay_LDSS-3_FLEET.ascii Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2026-03-20 18:12:08 - 2026-03-20 18:12:08 2461120.258431 - 2461120.258431 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
575089 2026-03-20 18:12:08 2461120.258431 20.05 0.19 ABMag L-GOTO GOTO-S_GOTO-3 180
cyan-ATLAS ATLAS-CHL_ATLAS-04 2026-03-26 07:34:41 - 2026-03-26 07:34:41 2461125.81575 - 2461125.81575 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570289 2026-03-26 07:34:41 2461125.81575 19.205 0.191 19.57 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
L-GOTO GOTO-N_GOTO-1 2026-03-16 06:09:59 - 2026-03-16 06:09:59 2461115.756935 - 2461115.756935 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
575088 2026-03-16 06:09:59 2461115.756935 19.8 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
BG-q-BlackGem BG4_BlackGEM-Cam4 2026-03-24 07:57:18 - 2026-03-24 07:57:18 2461123.8314583 - 2461123.8314583 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585578 2026-03-24 07:57:18 2461123.8314583 19.38 0.1 20.85 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic
BG-q-BlackGem BG3_BlackGEM-Cam3 2026-03-03 08:40:41 - 2026-03-03 08:40:41 2461102.8615856 - 2461102.8615856 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585577 2026-03-03 08:40:41 2461102.8615856 19.53 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic [Last non detection]
r-ZTF P48_ZTF-Cam 2026-03-17 12:05:04 - 2026-03-26 10:35:13 2461117.0035185 - 2461125.9411227 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570228 2026-03-26 10:35:13 2461125.9411227 18.9666 0.104137 ABMag r-ZTF P48_ZTF-Cam
570227 2026-03-18 10:06:58 2461117.9215046 19.9956 0.110371 ABMag r-ZTF P48_ZTF-Cam
570226 2026-03-17 12:05:04 2461117.0035185 19.3769 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-03-25 13:33:07 - 2026-03-25 13:33:07 2461125.06466 - 2461125.06466 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
570288 2026-03-25 13:33:07 2461125.06466 18.55 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [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
305355 2026-05-27 09:14:59 BlackGEM_Bot1 H. Tranin, F. Stoppa, D. Pieterse et al. BlackGEM BlackGEM 15:54:55.851 -08:07:38.85 2026-03-24 07:57:18.000 19.38 BG-q-BlackGem PSN BGEM J155455.85-080738.9 BlackGEM N
300047 2026-04-13 14:58:51 GOTO_bot M. Pursiainen, K. Ackley, M. Dyer et al. GOTO GOTO 15:54:55.863 -08:07:38.57 2026-03-20 18:12:08.352 20.05 L-GOTO PSN GOTO26dgx GOTO N
297450 2026-03-26 14:55:13 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 15:54:55.879 -08:07:38.33 2026-03-26 07:34:40.800 19.205 cyan-ATLAS PSN ATLAS26din ATLAS N
297419 2026-03-26 10:52:21 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 15:54:55.850 -08:07:38.26 2026-03-18 10:06:57.997 19.9956 r-ZTF PSN ZTF26aaoebni ZTF 2026TNSTR1307....1S N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24313 2026-07-18 00:29:30 Harsh Kumar Harsh Kumar FLEET SN IIn 0.035 1 FLEET We are reclassifying this object as a type IIn based on its match to the 2008fq event near peak spectra using NGSF. The object position has a significant offset from the nucleus of the host galaxy. The earlier classification was based on removing narrow galaxy lines, which led to a closer match to TDEs. However, the narrow lines with some contribution from IIn provide a better match to the spectra leading to this classification.
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
24320 2026-06-11 00:00:00 Magellan-Clay / LDSS-3 Harsh Kumar (Harvard CfA), Peter Blanchard (Harvard CfA) FLEET tns_2026hiw_2026-06-11_00-00-00_Magellan-Clay_LDSS-3_FLEET.ascii Object
24150 2026-06-30 17:03:49 TNS_Query Harsh Kumar (Harvard CfA), Peter Blanchard (Harvard CfA), Daichi Hiramatsu (UF), Alex Gagliano (CfA) FLEET TDE 0.035 1 FLEET Classified as TDE H+He at z=0.035, based on match to 2018fyk using SNID-SAGE (Stoppa, F. and Smartt, S. J. 2026). The spectrum is dominated by host-galaxy lines, which were masked for the classification procedure.
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
24156 2026-06-11 00:00:00 Magellan-Clay / LDSS-3 Harsh Kumar (Harvard CfA), Peter Blanchard (Harvard CfA), Daichi Hiramatsu (UF), Alex Gagliano (CfA) Harsh Kumar (Harvard CfA) FLEET tns_2026hiw_2026-06-11.000_Magellan-Clay_LDSS-3_FLEET.ascii Object

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