RA/DEC (2000)
16:10:00.271 +00:42:20.66
242.50113004 +0.705739537407
Type
SN II
Redshift
0.006
Discovery ReportClassification Report
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2026-02-25 04:19:50.880
TNS AT
Y
Public
Y
Discovery Mag
18.55
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_2026ejy - 2026-02-26 02:38:21 SALT / RSS (DLT40)z=
 ▌SN_2026ejy - 2026-02-25 21:29:56 Lijiang-2.4m / YFOSC (LiONS)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

 ▌LAST_LAST-Cam_Clear
 ▌GOTO-S_GOTO-3_L
 ▌PS2_GPC2_w
 ▌ATLAS-STH_ATLAS-03_orange
 ▌GOTO-N_GOTO-1_L
 ▌BG4_BlackGEM-Cam4_BG-q
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌P48_ZTF-Cam_r
 ▌ATLAS-HKO_ATLAS-02_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
23092 2026-02-26 02:38:21 SALT / RSS 933 R. Kuhn S. W. Jha DLT40 tns_2026ejy_2461097.609965275_SALT_RSS_DLT40.dat tns_2026ejy_2461097.609965275_SALT_RSS_DLT40.fits Object Blue continuum with clear Balmer P-Cyg profiles. H-alpha expansion velocity of 14,300 km/s.
23097 2026-02-25 21:29:56 Lijiang-2.4m / YFOSC Jujia Zhang LiONS tns_2026ejy_2026-02-25_21-29-56.104_Lijiang-2.4m_YFOSC_LiONS.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
Clear- LAST_LAST-Cam 2024-03-12 02:38:27 - 2026-02-28 00:13:24 2460381.61003 - 2461099.50931 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562155 2026-02-28 00:13:24 2461099.50931 17.3 ABMag Clear- LAST_LAST-Cam 400
562154 2024-03-12 02:38:27 2460381.61003 20.97 ABMag Clear- LAST_LAST-Cam 2400 [Last non detection]
L-GOTO GOTO-S_GOTO-3 2026-02-24 17:34:16 - 2026-02-24 17:34:16 2461096.23213 - 2461096.23213 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
561451 2026-02-24 17:34:16 2461096.23213 20.4 ABMag L-GOTO GOTO-S_GOTO-3 180 [Last non detection]
w-P1 PS2_GPC2 2026-04-22 13:41:34 - 2026-04-22 13:41:34 2461153.07053 - 2461153.07053 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577375 2026-04-22 13:41:34 2461153.07053 16.93 0.01 22 ABMag w-P1 PS2_GPC2 45 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2026-02-28 02:06:16 - 2026-02-28 02:06:16 2461099.58769 - 2461099.58769 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562516 2026-02-28 02:06:16 2461099.58769 17.23 0.064 19.39 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot
L-GOTO GOTO-N_GOTO-1 2026-02-25 04:19:51 - 2026-02-25 04:19:51 2461096.680448 - 2461096.680448 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
561452 2026-02-25 04:19:51 2461096.680448 18.55 0.07 ABMag L-GOTO GOTO-N_GOTO-1 180
BG-q-BlackGem BG4_BlackGEM-Cam4 2025-04-15 07:30:24 - 2025-04-15 07:30:24 2460780.8127778 - 2460780.8127778 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562685 2025-04-15 07:30:24 2460780.8127778 19.67 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic [Last non detection]
BG-q-BlackGem BG3_BlackGEM-Cam3 2026-03-03 08:47:57 - 2026-03-03 08:47:57 2461102.8666319 - 2461102.8666319 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562686 2026-03-03 08:47:57 2461102.8666319 17.13 0.03 19.75 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic
r-ZTF P48_ZTF-Cam 2026-02-24 11:29:35 - 2026-02-25 12:07:21 2461095.9788773 - 2461097.0051042 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
561550 2026-02-25 12:07:21 2461097.0051042 17.6751 0.0562602 ABMag r-ZTF P48_ZTF-Cam
561549 2026-02-24 11:29:35 2461095.9788773 19.3081 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-HKO_ATLAS-02 2026-02-25 13:36:47 - 2026-02-25 13:36:47 2461097.06721 - 2461097.06721 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
562515 2026-02-25 13:36:47 2461097.06721 19.29 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 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
301188 2026-04-23 19:28:55 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 16:10:00.271 +00:42:20.66 2026-04-22 13:41:33.792 16.93 w-P1 PSN PS26bcm Pan-STARRS N
293557 2026-03-04 06:34:02 BlackGEM_Bot1 H. Tranin, F. Stoppa, D. Pieterse et al. BlackGEM BlackGEM 16:10:00.255 +00:42:20.67 2026-03-03 08:47:57.000 17.13 BG-q-BlackGem PSN BGEM J161000.25+004220.7 BlackGEM N
293464 2026-03-02 08:52:13 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 16:10:00.273 +00:42:20.78 2026-02-28 02:06:16.416 17.23 orange-ATLAS PSN ATLAS26coa ATLAS N
293289 2026-02-28 04:18:02 LAST_Bot1 E. A. Zimmerman (WIS), R. Konno (WIS), A. Horowicz (WIS) et al. LAST LAST 16:10:00.234 +00:42:20.86 2026-02-28 00:13:24.384 17.3 Clear- PSN LAST N
292947 2026-02-25 12:58:48 Fritz Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 16:10:00.275 +00:42:20.63 2026-02-25 12:07:21.002 17.6751 r-ZTF PSN ZTF26aaiedvz ZTF Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). N
292904 2026-02-25 09:29:07 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 16:10:00.306 +00:42:20.40 2026-02-25 04:19:50.880 18.55 L-GOTO Other GOTO26bnq GOTO 2026TNSTR.804....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
23096 2026-02-26 10:01:39 Liping Li Liping Li, Zeyi Wang, Qian Zhai, Bo Wang, Jujia Zhang (YNAO); Xiaofeng Wang(THU) LiONS SN II 0.006 1 LiONS The spectrum obtained by LJT is similar to that of a young SN II with a "ledge" feature around 4700A. The redshift is obtained by NED. 2026TNSCR.851....1L
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
23097 2026-02-25 21:29:56 Lijiang-2.4m / YFOSC Jujia Zhang LiONS tns_2026ejy_2026-02-25_21-29-56.104_Lijiang-2.4m_YFOSC_LiONS.dat Object
23091 2026-02-26 04:59:21 Saurabh W. Jha Saurabh W. Jha (Rutgers) J. Andrews, D. J. Sand, K. A. Bostroem, S. Valenti, M. Lundquist, E. Hoang, M. Shrestha, Y. Dong, D. Janzen, G. Hosseinzadeh, J. Pearson, N. Meza, D. Metha, A. Ravi, A. Martas, B. Subrayan DLT40 SN II 0.0067 1 1 DLT40 young SN II 2026TNSCR.850....1J
Related files
File Comments Last Modified (UT) Modified By
tns_2026ejy_atrep_23091_DLT40.pdf Good SNID match to SN 1999gi at 7 days before maximum light 2026-02-26 04:59:21 Saurabh W. Jha
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
23092 2026-02-26 02:38:21 SALT / RSS 933 R. Kuhn S. W. Jha DLT40 tns_2026ejy_2461097.609965275_SALT_RSS_DLT40.dat tns_2026ejy_2461097.609965275_SALT_RSS_DLT40.fits Object Blue continuum with clear Balmer P-Cyg profiles. H-alpha expansion velocity of 14,300 km/s.

Comments

TNS
System

Thu, 04/23/2026 - 19:28

Object coordinates updated

Object coordinates updated according to AT-report 301188 of Group Pan-STARRS
Previous RA, DEC: 16:10:00.275, +00:42:20.63 (242.5011466, +0.7057316)
Updated RA, DEC: 16:10:00.271, +00:42:20.66 (242.50113004, +0.705739537407)

TNS
System

Wed, 02/25/2026 - 12:58

Object coordinates updated

Object coordinates updated according to AT-report 292947 of Group ZTF
Previous RA, DEC: 16:10:00.306, +00:42:20.40 (242.501276, +0.705666)
Updated RA, DEC: 16:10:00.275, +00:42:20.63 (242.5011466, +0.7057316)