RA/DEC (2000)
13:10:57.515 +11:28:26.16
197.7396447 +11.4739339
Type
SN II
Redshift
0.011
Reporting Group
GOTO
Discovering Data Source
GOTO
Discovery Date
2025-05-19 22:27:46.080
TNS AT
Y
Public
Y
Discovery Mag
18.73
Filter
L-GOTO
Reporter/s
A. Kumar, 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, B. Godson, T. Killestein, D. O'Neill, M. Pursiainen, on behalf of GOTO collaboration

Spectra

 SN_2025ktz - 2020-05-20 03:26:33 MMT / BINOSPEC (DLT40)z=
Show H at z=vexp= km/s
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Show [Ca II] at z=vexp= km/s
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 ATLAS-CHL_ATLAS-04_cyan
 GOTO-N_GOTO-1_L
 P48_ZTF-Cam_r
 P48_ZTF-Cam_g
 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
21061 2020-05-20 03:26:33 MMT / BINOSPEC 2700 J. Pearson, A. Milone, K. Salmas M. Shreshta DLT40 tns_2025ktz_2020-05-20_03-26-33_MMT_BINOSPEC_DLT40.dat tns_2025ktz_2020-05-20_03-26-33_MMT_BINOSPEC_DLT40.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
cyan-ATLAS ATLAS-CHL_ATLAS-04 2025-05-20 02:52:55 - 2025-05-20 02:52:55 2460815.62008 - 2460815.62008 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
489148 2025-05-20 02:52:55 2460815.62008 18.867 0.13 19.36 ABMag cyan-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
L-GOTO GOTO-N_GOTO-1 2025-05-18 21:46:21 - 2025-05-19 22:27:46 2460814.407192 - 2460815.435952 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
489113 2025-05-19 22:27:46 2460815.435952 18.73 0.1 ABMag L-GOTO GOTO-N_GOTO-1 180
489112 2025-05-18 21:46:21 2460814.407192 19.7 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-05-25 07:21:14 - 2025-05-25 07:21:14 2460820.806412 - 2460820.806412 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
491439 2025-05-25 07:21:14 2460820.806412 19.4526 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
g-ZTF P48_ZTF-Cam 2025-05-25 07:39:43 - 2025-05-25 07:39:43 2460820.8192477 - 2460820.8192477 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
491440 2025-05-25 07:39:43 2460820.8192477 19.3554 0.163947 ABMag g-ZTF P48_ZTF-Cam
orange-ATLAS ATLAS-MLO_ATLAS-01 2025-05-19 10:18:46 - 2025-05-19 10:18:46 2460814.9297 - 2460814.9297 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
489147 2025-05-19 10:18:46 2460814.9297 19.32 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
256695 2025-05-25 19:27:06 ZTF_CATS150 Nabeel Rehemtulla (CIERA, NU), Kaustav Kashyap Das (Caltech), Mansi Kasliwal (Caltech) et al. ZTF ZTF 13:10:57.515 +11:28:26.16 2025-05-25 07:39:43.001 19.3554 g-ZTF PSN ZTF25aarodfq ZTF N
255484 2025-05-20 06:38:31 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 13:10:57.512 +11:28:26.31 2025-05-20 02:52:54.912 18.867 cyan-ATLAS PSN ATLAS25fcw ATLAS N
255472 2025-05-19 22:48:22 GOTO_bot A. Kumar, K. Ackley, M. Dyer et al. GOTO GOTO 13:10:57.530 +11:28:26.18 2025-05-19 22:27:46.080 18.73 L-GOTO Other GOTO25cue GOTO 2025TNSTR1836....1K N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
21061 2025-05-20 06:43:16 K. Azalee Bostroem K. Azalee Bostroem, S. Valenti, D. J. Sand, S. W. Jha, M. Lundquist, J. E. Andrews, E. Hoang, M. Shrestha, Y. Dong, D. Janzen, G. Hosseinzadeh, J. Pearson, N. Meza, D. Mehta, A. Ravi, A. Martas, B. Subrayan, L. Kwok DLT40 SN II 0.011 1 DLT40 We obtained a spectrum with Binospec on MMT on 2020-05-20 03:26:33 (MJD=60815.14). Based on narrow H alpha in the host spectrum, we find a redshift of 0.011 consistent with that of UGC 08255. Our spectrum shows a blue continuum with shallow P Cygni profile which peaks around 6630, corresponding to H alpha at the host redshift. We therefore classify AT2025ktz as a Type II supernova. Given the relatively deep non-detection, the supernova is likely young, however, the velocity is low (4000-5000 km/s) causing some degeneracy in the template matching. 2025TNSCR1856....1B
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
21061 2020-05-20 03:26:33 MMT / BINOSPEC 2700 J. Pearson, A. Milone, K. Salmas M. Shreshta DLT40 tns_2025ktz_2020-05-20_03-26-33_MMT_BINOSPEC_DLT40.dat tns_2025ktz_2020-05-20_03-26-33_MMT_BINOSPEC_DLT40.fits Object

Comments

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 256695 of Group ZTF
Previous RA, DEC: 13:10:57.512, +11:28:26.31 (197.739632, +11.473976)
Updated RA, DEC: 13:10:57.515, +11:28:26.16 (197.7396447, +11.4739339)

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 255484 of Group ATLAS
Previous RA, DEC: 13:10:57.530, +11:28:26.18 (197.739709, +11.473938)
Updated RA, DEC: 13:10:57.512, +11:28:26.31 (197.739632, +11.473976)