RA/DEC (2000)
20:25:19.322 -02:29:59.80
306.3305079 -2.4999452
Type
SN Ia-CSM
Redshift
0.182
Discovery ReportClassification Report
Related AstroNotes: 2025-191, 2025-199, 2025-218, 2025-226
Reporting Group
ZTF
Discovering Data Source
ZTF
Discovery Date
2025-05-28 08:38:25.995
TNS AT
Y
Public
Y
Discovery Mag
20.6194
Filter
r-ZTF
Reporter/s
Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2025ndr - 2025-08-14 23:45:00 NOT / ALFOSC (SGLF)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-3_L
 ▌ATLAS-CHL_ATLAS-04_orange
 ▌GOTO-N_GOTO-1_L
 ▌P48_ZTF-Cam_r
 ▌P48_ZTF-Cam_g
 ▌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
21955 2025-08-14 23:45:00 NOT / ALFOSC 2400 S. Geier F. Poidevin SGLF tns_2025ndr_2025-08-14_23-45-00_NOT_ALFOSC_SGLF.txt Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-3 2025-06-04 18:35:50 - 2025-06-04 18:35:50 2460831.274894 - 2460831.274894 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
498810 2025-06-04 18:35:50 2460831.274894 19.71 0.21 ABMag L-GOTO GOTO-S_GOTO-3 180
orange-ATLAS ATLAS-CHL_ATLAS-04 2025-06-29 08:23:21 - 2025-06-29 08:23:21 2460855.84955 - 2460855.84955 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
499741 2025-06-29 08:23:21 2460855.84955 19.09 ABMag orange-ATLAS ATLAS-CHL_ATLAS-04 30 Robot [Last non detection]
L-GOTO GOTO-N_GOTO-1 2025-05-27 03:27:45 - 2025-05-27 03:27:45 2460822.644269 - 2460822.644269 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
498809 2025-05-27 03:27:45 2460822.644269 19.1 ABMag L-GOTO GOTO-N_GOTO-1 180 [Last non detection]
r-ZTF P48_ZTF-Cam 2025-05-28 08:38:26 - 2025-06-09 09:24:30 2460823.8600231 - 2460835.8920139 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
494295 2025-06-09 09:24:30 2460835.8920139 19.5974 0.178166 ABMag r-ZTF P48_ZTF-Cam
494294 2025-05-28 08:38:26 2460823.8600231 20.6194 0.295019 ABMag r-ZTF P48_ZTF-Cam
g-ZTF P48_ZTF-Cam 2025-05-26 09:09:35 - 2025-05-26 09:09:35 2460821.8816551 - 2460821.8816551 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
494293 2025-05-26 09:09:35 2460821.8816551 20.4531 ABMag g-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-HKO_ATLAS-02 2025-06-30 12:50:24 - 2025-06-30 12:50:24 2460857.035 - 2460857.035 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
499742 2025-06-30 12:50:24 2460857.035 19.217 0.175 19.47 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 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
260809 2025-07-01 07:32:38 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland et al. ATLAS ATLAS 20:25:19.323 -02:30:00.09 2025-06-30 12:50:24.000 19.217 orange-ATLAS PSN ATLAS25gsh ATLAS N
260310 2025-06-27 16:25:56 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 20:25:19.298 -02:29:59.96 2025-06-04 18:35:50.496 19.71 L-GOTO Other GOTO25dyk GOTO N
258065 2025-06-09 10:13:00 Fritz Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al. ZTF ZTF 20:25:19.322 -02:29:59.80 2025-05-28 08:38:25.995 20.6194 r-ZTF PSN ZTF25aatpeel ZTF 2025TNSTR2160....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
21955 2025-09-02 19:22:53 Ismael Perez-Fournon F. Poidevin (IAC and ULL), S. Geier (GRANTECAN and IAC), I. Pérez-Fournon (IAC and ULL), D. Cano-Morales (ULL), N. Elías-Rosa (INAF and ICE/CSIC), D. Aguado (IAC and ULL), and A. López-Oramas (IAC and ULL) SGLF SN Ia-CSM 0.182 1 SGLF SN Ia-CSM classified with NOT ALFOSC (grism 4). Z = 0.182 from host galaxy emission lines. It was selected for spectroscopic follow-up as a SLSN candidate using the ALeRCE light curve classification and the reports of Sheng et al. (AstroNotes 2025-191 and 2025-218) and Perley et al. (AstroNote 2025-199). Dhawan et al. (AstroNote 2025-226) classified it as a possible bright peculiar/lensed SNIa at z = 0.185. Using SNID (Tonry and Davis 2007) good matches of our NOT ALFOSC spectrum are obtained to templates of SNe Ia-CSM after maximum light (e.g. SN 2005gj at 39 to 52 days post maximum light). The ZTF light curve is available at the LSST/ZTF brokers, e.g.: https://alerce.online/object/ZTF25aatpeel, https://lasair-ztf.lsst.ac.uk/objects/ZTF25aatpeel, https://antares.noirlab.edu/loci/ANT20252n962qnwpllq, https://fink-portal.org/ZTF25aatpeel 2025TNSCR3531....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
21955 2025-08-14 23:45:00 NOT / ALFOSC 2400 S. Geier F. Poidevin SGLF tns_2025ndr_2025-08-14_23-45-00_NOT_ALFOSC_SGLF.txt Object

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