RA/DEC (2000)
21:28:47.590 +20:31:03.21
322.198290433 +20.5175588646
Type
SN IIn
Redshift
0.0177
Discovery ReportClassification Report
Related AstroNotes: 2026-217, 2026-236
Reporting Group
SNHunt
Discovering Data Source
CRTS
Discovery Date
2026-07-07 09:43:34.000
TNS AT
Y
Public
Y
Host Name
UGC 11749
Host Redshift
0.0177
Discovery Mag
20
Filter
V-crts-CRTS
Reporter/s
Michele Mazzucato on behalf of SNHunt
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026sfn - 2026-08-04 04:18:19 P60 / SEDM (ZTF)z=
 ▌SN_2026sfn - 2026-07-13 06:15:50 Gemini-S / GMOS-S (ZTF)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
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▌Show N II at z=vexp= km/s
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▌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

 ▌ATLAS-TDO_ATLAS-05_wide
 ▌LAST_LAST-Cam_Clear
 ▌PS2_GPC2_w
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌ATLAS-HKO_ATLAS-02_orange
 ▌Other_Other_V-crts
   
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
24424 2026-08-04 04:18:19 P60 / SEDM SEDM ZTF tns_2026sfn_2026-08-04_04-18-19_P60_SEDM_ZTF.txt Object
24272 2026-07-13 06:15:50 Gemini-S / GMOS-S Wynn Jacobson-Galan ZTF tns_2026sfn_2026-07-13_06-15-50_Gemini-S_GMOS-S_ZTF.cat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
wide-ATLAS ATLAS-TDO_ATLAS-05 2026-07-29 02:16:55 - 2026-07-29 02:16:55 2461250.59508 - 2461250.59508 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
608009 2026-07-29 02:16:55 2461250.59508 18.47 ABMag wide-ATLAS ATLAS-TDO_ATLAS-05 30 Robot [Last non detection]
Clear- LAST_LAST-Cam 2026-07-21 21:29:53 - 2026-08-05 20:14:14 2461243.39575 - 2461258.34322 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
609998 2026-08-05 20:14:14 2461258.34322 17.69 ABMag Clear- LAST_LAST-Cam 400
609997 2026-07-21 21:29:53 2461243.39575 20.41 ABMag Clear- LAST_LAST-Cam 400 [Last non detection]
w-P1 PS2_GPC2 2026-07-16 09:42:10 - 2026-07-16 09:42:10 2461237.90428 - 2461237.90428 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
605483 2026-07-16 09:42:10 2461237.90428 20.12 0.03 22 ABMag w-P1 PS2_GPC2 45 Robot
L-GOTO GOTO-N_GOTO-1 2026-07-06 01:49:11 - 2026-07-11 00:35:25 2461227.575817 - 2461232.524601 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
604076 2026-07-11 00:35:25 2461232.524601 19.94 0.17 ABMag L-GOTO GOTO-N_GOTO-1 180
604075 2026-07-06 01:49:11 2461227.575817 19.8 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2026-07-06 09:26:06 - 2026-07-10 09:24:18 2461227.893125 - 2461231.891875 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
602553 2026-07-10 09:24:18 2461231.891875 20.1 0.164861 ABMag r-ZTF P48_ZTF-Cam
602552 2026-07-06 09:26:06 2461227.893125 20.1807 0.128658 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2026-07-02 09:44:29 - 2026-07-02 09:44:29 2461223.9058912 - 2461223.9058912 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
602551 2026-07-02 09:44:29 2461223.9058912 20.2537 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-HKO_ATLAS-02 2026-07-30 12:39:08 - 2026-07-30 12:39:08 2461252.02718 - 2461252.02718 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
608010 2026-07-30 12:39:08 2461252.02718 18.236 0.134 18.56 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
V-crts-CRTS Other_Other 2025-11-29 03:01:31 - 2026-07-07 09:43:34 2461008.6260532 - 2461228.9052546 4
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
599375 2026-07-07 09:43:34 2461228.9052546 20 VegaMag V-crts-CRTS Other_Other MLS 10K CCD.
599376 2026-06-26 09:02:08 2461217.8764815 20.5 VegaMag V-crts-CRTS Other_Other MLS 10K CCD.
599377 2026-06-16 09:24:42 2461207.8921528 20.8 VegaMag V-crts-CRTS Other_Other
599374 2025-11-29 03:01:31 2461008.6260532 21.2 VegaMag V-crts-CRTS Other_Other [Last non detection] MLS 10K CCD.
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
318789 2026-08-06 04:57:19 LAST_Bot1 E. O. Ofek (WIS), R. Konno (WIS), E. A. Zimmerman (WIS) et al. LAST LAST 21:28:47.556 +20:31:01.12 2026-08-05 20:14:14.208 17.69 Clear- PSN LAST N
317445 2026-07-31 09:17:34 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 21:28:47.592 +20:31:02.80 2026-07-30 12:39:08.352 18.236 orange-ATLAS PSN ATLAS26jig ATLAS N
315957 2026-07-20 17:17:46 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 21:28:47.590 +20:31:03.21 2026-07-16 09:42:09.792 20.12 w-P1 PSN PS26fck Pan-STARRS N
315315 2026-07-15 08:44:36 GOTO_bot G. Ramsay, J. Lyman, K. Ackley et al. GOTO GOTO 21:28:47.575 +20:31:02.84 2026-07-11 00:35:25.440 19.94 L-GOTO Other GOTO26gui GOTO N
314431 2026-07-11 20:55:53 Fritz Wynn Jacobson-Galán (Caltech), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 21:28:47.600 +20:31:03.04 2026-07-06 09:26:05.999 20.1807 r-ZTF PSN ZTF26abgbpyv ZTF N
313082 2026-07-07 15:32:13 Andrew Drake Michele Mazzucato on behalf of SNHunt SNHunt CRTS 21:28:47.568 +20:31:02.64 2026-07-07 09:43:34.000 20 V-crts-CRTS PSN UGC 11749 CRTS Detected on three nights on bright galaxy spiral arm. Not present in archival MLS, ZTF or Legacy Survey data. Variable star contamination possible due to crowded field. 2026TNSTR2828....1M N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
24417 2026-08-05 06:14:12 Wynn Jacobson-Galan Wynn Jacobson-Galan ZTF SN IIn 1 ZTF Precursor candidate has now exploded and is a type IIn supernova. 2026TNSCR3178....1J
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
24424 2026-08-04 04:18:19 P60 / SEDM SEDM ZTF tns_2026sfn_2026-08-04_04-18-19_P60_SEDM_ZTF.txt Object
24266 2026-07-14 18:56:08 Wynn Jacobson-Galan Wynn Jacobson-Galan ZTF Impostor-SN 0.0177 1 ZTF Supernova precursor candidate similar to SN 2023ldh "Event A."
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
24272 2026-07-13 06:15:50 Gemini-S / GMOS-S Wynn Jacobson-Galan ZTF tns_2026sfn_2026-07-13_06-15-50_Gemini-S_GMOS-S_ZTF.cat Object

Comments

TNS
System

Mon, 07/20/2026 - 17:17

Object coordinates updated

Object coordinates updated according to AT-report 315957 of Group Pan-STARRS
Previous RA, DEC: 21:28:47.600, +20:31:03.04 (322.1983315, +20.5175109)
Updated RA, DEC: 21:28:47.590, +20:31:03.21 (322.198290433, +20.5175588646)

TNS
System

Sat, 07/11/2026 - 20:55

Object coordinates updated

Object coordinates updated according to AT-report 314431 of Group ZTF
Previous RA, DEC: 21:28:47.568, +20:31:02.64 (322.1982, +20.5174)
Updated RA, DEC: 21:28:47.600, +20:31:03.04 (322.1983315, +20.5175109)