RA/DEC (2000)
05:02:40.327 -08:18:31.89
75.668027505 -8.30885856197
Type
SN IIb
Redshift
0.012125
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2026-01-29 10:59:03.552
TNS AT
Y
Public
Y
Discovery Mag
18.37
Filter
L-GOTO
Reporter/s
B. Godson, 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, T. Killestein, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration

Spectra

 SN_2026bpu - 2026-02-11 12:17:28 LCO2m / Spectral (Global SN Project)z=
 SN_2026bpu - 2026-02-04 14:24:00 ANU-2.3m / WiFeS (None)z=
 SN_2026bpu - 2026-01-30 02:06:38 SOAR / Goodman (PASSTA)z=
Show H at z=vexp= km/s
Show He at z=vexp= km/s
Show He II at z=vexp= km/s
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Show Tellurics 
Show Galaxy lines at z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 GOTO-S_GOTO-3_L
 PS2_GPC2_w
 ATLAS-STH_ATLAS-03_orange
 GOTO-N_GOTO-1_L
 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
22974 2026-02-11 12:17:28 LCO2m / Spectral 1800 LCO Joseph Farah Global SN Project tns_2026bpu_2026-02-11_12-17-28_LCO2m_Spectral_Global_SN_Project.ascii Object
22926 2026-02-04 14:24:00 ANU-2.3m / WiFeS 600 Robotic C. Lidman None tns_2026bpu_2026-02-04.6_ANU-2.3m_WiFeS_None.dat tns_2026bpu_2026-02-04.6_ANU-2.3m_WiFeS_None.fits Object
22884 2026-01-30 02:06:38 SOAR / Goodman 900 César Briceño Aravind Ravi PASSTA tns_2026bpu_2026-01-30_02-06-38.422_SOAR_Goodman_PASSTA.txt tns_2026bpu_2026-01-30_02-06-38.422_SOAR_Goodman_PASSTA.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2026-01-29 10:59:04 - 2026-01-29 10:59:04 2461069.957675 - 2461069.957675 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
554495 2026-01-29 10:59:04 2461069.957675 18.37 0.09 ABMag L-GOTO GOTO-S_GOTO-3 180
w-P1 PS2_GPC2 2026-01-30 05:51:02 - 2026-01-30 05:51:02 2461070.74377 - 2461070.74377 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
555169 2026-01-30 05:51:02 2461070.74377 17.36 0.01 22 ABMag w-P1 PS2_GPC2 45 Robot
orange-ATLAS ATLAS-STH_ATLAS-03 2026-01-28 20:10:50 - 2026-01-28 20:10:50 2461069.34086 - 2461069.34086 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
554903 2026-01-28 20:10:50 2461069.34086 18.57 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-1 2026-01-28 21:20:06 - 2026-01-28 21:20:06 2461069.38896 - 2461069.38896 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
554494 2026-01-28 21:20:06 2461069.38896 19.2 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2026-01-27 04:12:47 - 2026-01-30 04:34:25 2461067.675544 - 2461070.6905671 3
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
554961 2026-01-30 04:34:25 2461070.6905671 17.4893 0.0706978 ABMag r-ZTF P48_ZTF-Cam
554962 2026-01-30 04:34:25 2461070.6905671 17.5566 0.0401314 ABMag r-ZTF P48_ZTF-Cam
554960 2026-01-27 04:12:47 2461067.675544 19.4893 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-01-30 07:41:13 - 2026-01-30 07:41:13 2461070.82029 - 2461070.82029 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
554904 2026-01-30 07:41:13 2461070.82029 17.44 0.062 18.83 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 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
289637 2026-02-01 01:09:16 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 05:02:40.327 -08:18:31.89 2026-01-30 05:51:01.728 17.36 w-P1 PSN PS26pb Pan-STARRS N
289534 2026-01-31 03:46:21 Fritz Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 05:02:40.326 -08:18:32.00 2026-01-30 04:34:24.997 17.4893 r-ZTF PSN ZTF26aaeghfx ZTF N
289487 2026-01-30 21:27:29 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 05:02:40.337 -08:18:32.00 2026-01-30 07:41:13.056 17.44 orange-ATLAS PSN ATLAS26bgo ATLAS N
289273 2026-01-29 11:17:39 GOTO_bot B. Godson, D. O'Neill, K. Ackley et al. GOTO GOTO 05:02:40.322 -08:18:32.31 2026-01-29 10:59:03.552 18.37 L-GOTO Other GOTO26ajo GOTO 2026TNSTR.383....1G N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
22973 2026-02-12 00:24:51 Joseph Farah Joseph Farah (UCSB/LCO), Moira Andrews, Kathryn Wynn, D. Andrew Howell, Curtis McCully, Jake Ridenbaugh Global SN Project SN IIb 0.012125 1 Global SN Project We report the re-classification of 26bpu as a IIb SN. Early spectra showed a strong H-alpha line which weakened over time. Recent spectra show a good match with SNID (Blondin & Tonry 2007, ApJ, 666, 1024) to a IIb at ~21 days post-peak. The light curve shows an apparent double-peak feature commonly associated with IIb SNe with early excess emission. Further follow-up is encouraged. 2026TNSCR.613....1F
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
22974 2026-02-11 12:17:28 LCO2m / Spectral 1800 LCO Joseph Farah Global SN Project tns_2026bpu_2026-02-11_12-17-28_LCO2m_Spectral_Global_SN_Project.ascii Object
22925 2026-02-05 21:40:49 Chris Lidman C. Lidman (ANU), B. P. Schmidt (ANU), K. Auchettl (University of Melbourne/UCSC), B. Martin (ANU), A. Moller (Swinburne), L. Rauf (ANU), and B. E. Tucker (ANU) None SN II 0.01221 1 Classified with Superfit 2026TNSCR.492....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
22926 2026-02-04 14:24:00 ANU-2.3m / WiFeS 600 Robotic C. Lidman None tns_2026bpu_2026-02-04.6_ANU-2.3m_WiFeS_None.dat tns_2026bpu_2026-02-04.6_ANU-2.3m_WiFeS_None.fits Object
22883 2026-01-30 06:16:15 Griffin Hosseinzadeh Griffin Hosseinzadeh, Aravind Ravi, César Briceño, James Freeburn, Sebastian Gomez, Brian Hsu, Saurabh Jha, Charles Kilpatrick, Jeniveve Pearson, David Sand, Manisha Shrestha, Bhagya Subrayan, on behalf of PASSTA PASSTA SN 0.012125 1 PASSTA The spectrum shows a blue continuum with possible flash-ionized features around 4600 Å and 4800 Å, likely indicating a young core-collapse supernova. 2026TNSCR.408....1H
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
22884 2026-01-30 02:06:38 SOAR / Goodman 900 César Briceño Aravind Ravi PASSTA tns_2026bpu_2026-01-30_02-06-38.422_SOAR_Goodman_PASSTA.txt tns_2026bpu_2026-01-30_02-06-38.422_SOAR_Goodman_PASSTA.fits Object

Comments

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 289637 of Group Pan-STARRS
Previous RA, DEC: 05:02:40.326, -08:18:32.00 (75.6680244, -8.3088891)
Updated RA, DEC: 05:02:40.327, -08:18:31.89 (75.668027505, -8.30885856197)

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 289534 of Group ZTF
Previous RA, DEC: 05:02:40.337, -08:18:32.00 (75.6680716667, -8.30889)
Updated RA, DEC: 05:02:40.326, -08:18:32.00 (75.6680244, -8.3088891)

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 289487 of Group ATLAS
Previous RA, DEC: 05:02:40.322, -08:18:32.31 (75.668009, -8.308975)
Updated RA, DEC: 05:02:40.337, -08:18:32.00 (75.6680716667, -8.30889)