RA/DEC (2000)
03:55:22.794 -28:09:32.69
58.8449736749 -28.1590797926
Type
SN II
Redshift
0.005
Discovery ReportClassification Report
Related AstroNotes: 2025-244, 2025-247
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2025-08-07 07:55:42.240
TNS AT
Y
Public
Y
Discovery Mag
15.837
Filter
orange-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025tis - 2025-08-08 10:24:00 SOAR / Goodman (None)z=
 ▌SN_2025tis - 2025-08-08 09:21:05 ESO-NTT / EFOSC2-NTT (ePESSTO+)z=
 ▌SN_2025tis - 2025-08-08 03:59:43 Lesedi / Mookodi (BlackGEM)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
 ▌PS2_GPC2_w
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌PS1_GPC1_i
   
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
21724 2025-08-08 10:24:00 SOAR / Goodman R. Cartier R. Cartier None tns_2025tis_2025-08-08_10-24-00_SOAR_Goodman_None.txt Object Using SNID (Blondin, S. & Tonry, J. L. 2007. ApJ, 666, 1024), the best match is with a young SN II, the broad feature yield a decent fit with a SNe Ic-BL at a different redshift. Follow-up observations are encouraged to confirm our tentative type II classification.
21728 2025-08-08 09:21:05 ESO-NTT / EFOSC2-NTT 300 Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter ePESSTO+ tns_2025tis_2025-08-08_09-21-05_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2025tis_2025-08-08_09-21-05_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
21722 2025-08-08 03:59:43 Lesedi / Mookodi 600 Orapeleng Mogawana Simon de Wet BlackGEM tns_2025tis_2025-08-08_03-59-42.748_Lesedi_Mookodi_BlackGEM.csv Object The spectrum was taken with the SAAO's 1-m Lesedi robotic telescope with the Mookodi low-resolution spectrograph and imager as part of the SAAO local transient program. The spectrum was taken with the widest (4") slit width, which yields a spectral resolution of R ~ 200 at 6000 Angstrom. [1] https://doi.org/10.1117/1.JATIS.10.2.025005 [2] https://doi.org/10.1117/12.3015250
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2024-07-30 18:20:21 - 2025-08-12 16:19:31 2460522.264125 - 2460900.18022 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
549310 2025-08-12 16:19:31 2460900.18022 15.35 0.01 ABMag L-GOTO GOTO-S_GOTO-4 180
549309 2024-07-30 18:20:21 2460522.264125 20.2 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
w-P1 PS2_GPC2 2025-12-02 08:11:04 - 2025-12-02 08:11:04 2461011.84102 - 2461011.84102 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
539255 2025-12-02 08:11:04 2461011.84102 17.12 0.01 22 ABMag w-P1 PS2_GPC2 45 Robot
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-08-06 09:10:53 - 2025-08-07 07:55:42 2460893.88256 - 2460894.83035 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
507755 2025-08-07 07:55:42 2460894.83035 15.837 0.03 18.52 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot
507754 2025-08-06 09:10:53 2460893.88256 18.84 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
r-ZTF P48_ZTF-Cam 2025-12-05 06:58:38 - 2025-12-05 06:58:38 2461014.7907176 - 2461014.7907176 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
536310 2025-12-05 06:58:38 2461014.7907176 16.9574 0.0483799 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2025-12-06 06:58:58 - 2025-12-06 06:58:58 2461015.7909491 - 2461015.7909491 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
536311 2025-12-06 06:58:58 2461015.7909491 18.2071 0.118548 ABMag g-ZTF P48_ZTF-Cam
i-P1 PS1_GPC1 2025-11-03 12:05:43 - 2025-11-03 12:05:43 2460983.00397 - 2460983.00397 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
528650 2025-11-03 12:05:43 2460983.00397 15.5 0.01 20.7 ABMag i-P1 PS1_GPC1 27 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
286853 2026-01-13 11:02:00 GOTO_bot D. O'Neill,J. Lyman,K. Ackley et al. GOTO GOTO 03:55:22.778 -28:09:32.62 2025-08-12 16:19:31.008 15.35 L-GOTO Other GOTO24kfm GOTO N
280785 2025-12-15 18:21:55 PS1_Bot1 K. C. Chambers,T. de Boer,J. Fairlamb et al. Pan-STARRS Pan-STARRS 03:55:22.794 -28:09:32.69 2025-12-02 08:11:04.128 17.12 w-P1 PSN PS25iht Pan-STARRS N
279461 2025-12-06 08:47:42 Fritz Jesper Sollerman (SU),Christoffer Fremling (Caltech),Daniel Perley (LJMU) et al. ZTF ZTF 03:55:22.785 -28:09:32.61 2025-12-05 06:58:38.000 16.9574 r-ZTF PSN ZTF25acfwzgw ZTF N
275582 2025-11-03 15:28:38 YSE_Bot1 D. O. Jones (UC Santa Cruz),K. D. French (Carnegie,Illinois) et al. YSE Pan-STARRS 03:55:22.788 -28:09:32.65 2025-11-03 12:05:43.008 15.5 i-P1 PSN PS25iht Pan-STARRS N
265210 2025-08-07 10:21:13 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland et al. ATLAS ATLAS 03:55:22.779 -28:09:32.68 2025-08-07 07:55:42.240 15.837 orange-ATLAS PSN ATLAS25jdr ATLAS 2025TNSTR3102....1T N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
21728 2025-08-08 18:34:08 ePESSTOplus_Bot1 Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani, Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter, Ofer Yaron on behalf of ePESSTO+ ePESSTO+ SN II 0.005 1 ePESSTO+ 2025TNSCR3118....1V
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
21728 2025-08-08 09:21:05 ESO-NTT / EFOSC2-NTT 300 Joyce Naomi Dominique van Dalen, Daniele Bjørn Malesani Antonio Martin-Carrillo, Gregory Corcoran, Laura Cotter ePESSTO+ tns_2025tis_2025-08-08_09-21-05_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2025tis_2025-08-08_09-21-05_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
21724 2025-08-08 14:42:56 Regis Cartier R. Cartier (CITEVA), H. Bommireddy (U. de Chile), S. Kaur (CITEVA), J. L. Prieto, and E. Hueichapan (UDP) None SN 0.005093 1 1 The SN shows a broad feature at ~4500 A (FWHM ~ 280 A or ~17000 km/s) which is potentially produced by Hbeta. The most likely classification is a young SN II but follow-up observations are encouraged to confirm this classification. 2025TNSCR3120....1C
Related files
File Comments Last Modified (UT) Modified By
tns_2025tis_atrep_21724.ps 2025-08-08 14:42:56 Regis Cartier
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
21724 2025-08-08 10:24:00 SOAR / Goodman R. Cartier R. Cartier None tns_2025tis_2025-08-08_10-24-00_SOAR_Goodman_None.txt Object Using SNID (Blondin, S. & Tonry, J. L. 2007. ApJ, 666, 1024), the best match is with a young SN II, the broad feature yield a decent fit with a SNe Ic-BL at a different redshift. Follow-up observations are encouraged to confirm our tentative type II classification.
21722 2025-08-08 12:15:26 Orapeleng Mogawana Orapeleng Mogawana (UCT/SAAO), Simon de Wet (DTU Space), Nicolas Erasmus (SAAO) BlackGEM SN 0.005093 1 1 BlackGEM, SAAO IO The spectrum shows a featureless blue continuum. Based on NGSF spectral classification software, the best-matching template contribution is from a young type II SN. Further follow-up observations are encouraged. 2025TNSCR3116....1M
Related files
File Comments Last Modified (UT) Modified By
tns_2025tis_atrep_21722_BlackGEM.pdf 2025-08-08 12:15:26 Orapeleng Mogawana
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
21722 2025-08-08 03:59:43 Lesedi / Mookodi 600 Orapeleng Mogawana Simon de Wet BlackGEM tns_2025tis_2025-08-08_03-59-42.748_Lesedi_Mookodi_BlackGEM.csv Object The spectrum was taken with the SAAO's 1-m Lesedi robotic telescope with the Mookodi low-resolution spectrograph and imager as part of the SAAO local transient program. The spectrum was taken with the widest (4") slit width, which yields a spectral resolution of R ~ 200 at 6000 Angstrom. [1] https://doi.org/10.1117/1.JATIS.10.2.025005 [2] https://doi.org/10.1117/12.3015250

Comments

TNS
System

Mon, 12/15/2025 - 18:21

Object coordinates updated

Object coordinates updated according to AT-report 280785 of Group Pan-STARRS
Previous RA, DEC: 03:55:22.788, -28:09:32.65 (58.8449494484, -28.1590708088)
Updated RA, DEC: 03:55:22.794, -28:09:32.69 (58.8449736749, -28.1590797926)

TNS
System

Mon, 11/03/2025 - 15:28

Object coordinates updated

Object coordinates updated according to AT-report 275582 of Group Pan-STARRS
Previous RA, DEC: 03:55:22.779, -28:09:32.68 (58.8449125, -28.1590775)
Updated RA, DEC: 03:55:22.788, -28:09:32.65 (58.8449494484, -28.1590708088)