RA/DEC (2000)
12:52:09.438 -21:51:40.34
193.039324625 -21.8612057115
Type
SN Ia-91bg-like
Redshift
0.023
Discovery ReportClassification Report
Related AstroNotes: 2026-142, 2026-141
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2026-05-17 08:11:37.824
TNS AT
Y
Public
Y
Discovery Mag
18.973
Filter
orange-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland (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, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (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_2026mxl - 2026-05-18 05:21:35 ESO-NTT / EFOSC2-NTT (ePESSTO+)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-STH_ATLAS-03_orange
 ▌BG4_BlackGEM-Cam4_BG-q
 ▌BG3_BlackGEM-Cam3_BG-q
 ▌P48_ZTF-Cam_i
 ▌P48_ZTF-Cam_r
 ▌ATLAS-MLO_ATLAS-01_orange
 ▌PS1_GPC1_w
   
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
23770 2026-05-18 05:21:35 ESO-NTT / EFOSC2-NTT 1800 J. Khaulsay,J. Quirola-Vásquez C. Aster ePESSTO+ tns_2026mxl_2026-05-18_05-21-35_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mxl_2026-05-18_05-21-35_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
L-GOTO GOTO-S_GOTO-4 2026-05-15 10:03:40 - 2026-05-24 10:46:36 2461175.919205 - 2461184.949033 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585132 2026-05-24 10:46:36 2461184.949033 18.14 0.04 ABMag L-GOTO GOTO-S_GOTO-4 180
585131 2026-05-15 10:03:40 2461175.919205 20.4 ABMag L-GOTO GOTO-S_GOTO-4 180 [Last non detection]
orange-ATLAS ATLAS-STH_ATLAS-03 2026-05-15 21:55:59 - 2026-05-15 21:55:59 2461176.41388 - 2461176.41388 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
583380 2026-05-15 21:55:59 2461176.41388 19.58 ABMag orange-ATLAS ATLAS-STH_ATLAS-03 30 Robot [Last non detection]
BG-q-BlackGem BG4_BlackGEM-Cam4 2026-04-07 04:37:07 - 2026-04-07 04:37:07 2461137.6924421 - 2461137.6924421 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
583780 2026-04-07 04:37:07 2461137.6924421 20.14 ABMag BG-q-BlackGem BG4_BlackGEM-Cam4 60 robotic [Last non detection]
BG-q-BlackGem BG3_BlackGEM-Cam3 2026-05-19 01:09:09 - 2026-05-19 01:09:09 2461179.5480208 - 2461179.5480208 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
583781 2026-05-19 01:09:09 2461179.5480208 18.73 0.05 20.57 ABMag BG-q-BlackGem BG3_BlackGEM-Cam3 60 robotic
i-ZTF P48_ZTF-Cam 2026-05-24 04:30:28 - 2026-05-25 05:32:54 2461184.6878241 - 2461185.7311806 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585232 2026-05-25 05:32:54 2461185.7311806 17.9454 0.0761764 ABMag i-ZTF P48_ZTF-Cam
585231 2026-05-24 04:30:28 2461184.6878241 17.9698 0.117597 ABMag i-ZTF P48_ZTF-Cam
r-ZTF P48_ZTF-Cam 2026-05-09 06:33:27 - 2026-05-09 06:33:27 2461169.7732292 - 2461169.7732292 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
585230 2026-05-09 06:33:27 2461169.7732292 20.3166 ABMag r-ZTF P48_ZTF-Cam [Last non detection]
orange-ATLAS ATLAS-MLO_ATLAS-01 2026-05-17 08:11:38 - 2026-05-17 08:11:38 2461177.84141 - 2461177.84141 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
583381 2026-05-17 08:11:38 2461177.84141 18.973 0.147 19.47 ABMag orange-ATLAS ATLAS-MLO_ATLAS-01 30 Robot
w-P1 PS1_GPC1 2026-05-17 07:16:27 - 2026-05-17 07:16:27 2461177.80309 - 2461177.80309 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
584250 2026-05-17 07:16:27 2461177.80309 19.22 0.05 22 ABMag w-P1 PS1_GPC1 45 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
305182 2026-05-25 05:42:28 BTSbot_bot Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), Theophile du Laz (Caltech) on behalf of ZTF ZTF ZTF 12:52:09.439 -21:51:40.39 2026-05-24 04:30:28.002 17.9698 i-ZTF PSN ZTF26aayhntm ZTF Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167). N
305137 2026-05-24 15:21:21 GOTO_bot D. O'Neill, K. Ackley, M. Dyer et al. GOTO GOTO 12:52:09.436 -21:51:40.34 2026-05-24 10:46:36.192 18.14 L-GOTO Other GOTO26fdq GOTO N
304731 2026-05-20 21:15:18 PS1_Bot1 K. C. Chambers, T. de Boer, J. Fairlamb et al. Pan-STARRS Pan-STARRS 12:52:09.438 -21:51:40.34 2026-05-17 07:16:26.976 19.22 w-P1 PSN PS26bld Pan-STARRS N
304505 2026-05-19 06:12:02 BlackGEM_Bot1 G. Ramsay, H. Tranin, F. Stoppa et al. BlackGEM BlackGEM 12:52:09.452 -21:51:40.16 2026-05-19 01:09:09.000 18.73 BG-q-BlackGem PSN BGEM J125209.45-215140.2 BlackGEM N
304194 2026-05-17 17:53:52 ATLAS_Bot1 J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al. ATLAS ATLAS 12:52:09.457 -21:51:40.07 2026-05-17 08:11:37.824 18.973 orange-ATLAS PSN ATLAS26fuo ATLAS 2026TNSTR2137....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
23766 2026-05-18 16:05:21 ePESSTOplus_Bot1 J. Khaulsay,J. Quirola-Vásquez, C. Aster, A. Horowicz on behalf of ePESSTO+ ePESSTO+ SN Ia-91bg-like 0.023 1 ePESSTO+ 2026TNSCR2164....1K
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
23770 2026-05-18 05:21:35 ESO-NTT / EFOSC2-NTT 1800 J. Khaulsay,J. Quirola-Vásquez C. Aster ePESSTO+ tns_2026mxl_2026-05-18_05-21-35_ESO-NTT_EFOSC2-NTT_ePESSTO+.asci tns_2026mxl_2026-05-18_05-21-35_ESO-NTT_EFOSC2-NTT_ePESSTO+.fits Object

Comments

TNS
System

Wed, 05/20/2026 - 21:15

Object coordinates updated

Object coordinates updated according to AT-report 304731 of Group Pan-STARRS
Previous RA, DEC: 12:52:09.452, -21:51:40.16 (193.039383, -21.861156)
Updated RA, DEC: 12:52:09.438, -21:51:40.34 (193.039324625, -21.8612057115)

TNS
System

Tue, 05/19/2026 - 06:12

Object coordinates updated

Object coordinates updated according to AT-report 304505 of Group BlackGEM
Previous RA, DEC: 12:52:09.457, -21:51:40.07 (193.039405, -21.86113)
Updated RA, DEC: 12:52:09.452, -21:51:40.16 (193.039383, -21.861156)