RA/DEC (2000)
10:53:55.518 -16:06:06.72
163.4813258 -16.1018664
Type
SN II
Redshift
0.014577
Discovery ReportClassification Report
Related AstroNotes: 2026-117, 2026-134
Reporting Group
ASAS-SN
Discovering Data Source
ASAS-SN
Discovery Date
2026-04-22 02:52:48.000
TNS AT
Y
Public
Y
Host Name
MCG -03-28-017
Host Redshift
0.014577
Discovery Mag
16.2
Filter
g-Sloan
Reporter/s
K. Z. Stanek, for the ASAS-SN team
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2026kia - 2026-04-23 22:20:01 NOT / ALFOSC (GOTO)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
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌P48_ZTF-Cam_i
 ▌P48_ZTF-Cam_r
 ▌ATLAS-HKO_ATLAS-02_orange
 ▌ASASSN-2_Cassius_g
   
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
23550 2026-04-23 22:20:01 NOT / ALFOSC Laura Fuglsang GOTO tns_2026kia_2026-04-23_22-20-00.575_NOT_ALFOSC_GOTO.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2026-04-16 10:51:43 - 2026-04-20 13:43:09 2461146.952577 - 2461151.071626 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577127 2026-04-20 13:43:09 2461151.071626 18.62 0.06 ABMag L-GOTO GOTO-S_GOTO-4 180
577126 2026-04-16 10:51:43 2461146.952577 20.1 ABMag L-GOTO GOTO-S_GOTO-4 90 [Last non detection]
orange-ATLAS ATLAS-CHL_ATLAS-04 2026-04-22 02:53:34 - 2026-04-22 02:53:34 2461152.62053 - 2461152.62053 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577648 2026-04-22 02:53:34 2461152.62053 16.798 0.036 19.44 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
i-ZTF P48_ZTF-Cam 2026-04-17 06:04:47 - 2026-04-23 06:34:25 2461147.7533218 - 2461153.7739005 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577775 2026-04-23 06:34:25 2461153.7739005 16.7875 0.0354182 ABMag i-ZTF P48_ZTF-Cam
577774 2026-04-17 06:04:47 2461147.7533218 19.9035 ABMag i-ZTF P48_ZTF-Cam [Last non detection]
r-ZTF P48_ZTF-Cam 2026-04-25 05:02:33 - 2026-04-25 05:02:33 2461155.7101042 - 2461155.7101042 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577776 2026-04-25 05:02:33 2461155.7101042 16.431 0.0266994 ABMag r-ZTF P48_ZTF-Cam
orange-ATLAS ATLAS-HKO_ATLAS-02 2026-04-19 09:48:02 - 2026-04-19 09:48:02 2461149.90836 - 2461149.90836 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
577647 2026-04-19 09:48:02 2461149.90836 19.4 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot [Last non detection]
g-Sloan ASASSN-2_Cassius 2026-04-20 04:48:00 - 2026-04-22 02:52:48 2461150.7 - 2461152.62 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
576880 2026-04-22 02:52:48 2461152.62 16.2 ABMag g-Sloan ASASSN-2_Cassius
576879 2026-04-20 04:48:00 2461150.7 18.1 ABMag g-Sloan ASASSN-2_Cassius [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
301386 2026-04-25 06:44:28 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 10:53:55.518 -16:06:06.72 2026-04-23 06:34:25.003 16.7875 i-ZTF PSN ZTF26aatvifj ZTF N
301322 2026-04-24 09:29:09 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 10:53:55.512 -16:06:06.68 2026-04-22 02:53:33.792 16.798 orange-ATLAS PSN ATLAS26eut ATLAS N
301067 2026-04-23 09:41:04 GOTO_bot G. Ramsay, K. Ackley, M. Dyer et al. GOTO GOTO 10:53:55.500 -16:06:06.85 2026-04-20 13:43:08.832 18.62 L-GOTO Other GOTO26dpt GOTO N
300948 2026-04-22 14:14:36 Krzysztof Stanek K. Z. Stanek, for the ASAS-SN team ASAS-SN ASAS-SN 10:53:55.423 -16:06:08.10 2026-04-22 02:52:48.000 16.2 g-Sloan PSN MCG -03-28-017 ASASSN-26cz ASAS-SN On the rise 2026TNSTR1762....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
23547 2026-04-24 08:21:24 Miika Pursiainen M. Pursiainen, T. Reynolds, J. Lyman, K. Ackley, M. J. Dyer, K. Ulaczyk, S. Belkin, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, D. Pollacco, J. Casares Vel'azquez, Tom Killestein, A. Kumar, D. O'Neill GOTO SN II 0.014577 1 GOTO Good template matches to young Type II SNe, matching the current age of the transient (<5d from explosion). As the spectrum does not exhibit any narrow host galaxy lines, the redshift is unclear but likely low (z<0.015) given the brightness of the event and the best spectral fits. We assume the redshift of the brighter nearby galaxy, MCG-03-28-017, towards South East of the SN (0.014577, NED), but emphasise that the actual host galaxy may not be found at the redshift. 2026TNSCR1811....1P
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
23550 2026-04-23 22:20:01 NOT / ALFOSC Laura Fuglsang GOTO tns_2026kia_2026-04-23_22-20-00.575_NOT_ALFOSC_GOTO.dat Object

Comments

TNS
System

Sat, 04/25/2026 - 06:44

Object coordinates updated

Object coordinates updated according to AT-report 301386 of Group ZTF
Previous RA, DEC: 10:53:55.512, -16:06:06.68 (163.4813, -16.101855)
Updated RA, DEC: 10:53:55.518, -16:06:06.72 (163.4813258, -16.1018664)

TNS
System

Fri, 04/24/2026 - 09:29

Object coordinates updated

Object coordinates updated according to AT-report 301322 of Group ATLAS
Previous RA, DEC: 10:53:55.500, -16:06:06.85 (163.48125, -16.101902)
Updated RA, DEC: 10:53:55.512, -16:06:06.68 (163.4813, -16.101855)

TNS
System

Thu, 04/23/2026 - 09:41

Object coordinates updated

Object coordinates updated according to AT-report 301067 of Group GOTO
Previous RA, DEC: 10:53:55.423, -16:06:08.10 (163.48093, -16.10225)
Updated RA, DEC: 10:53:55.500, -16:06:06.85 (163.48125, -16.101902)