RA/DEC (2000)
09:05:51.083 -08:35:07.56
136.462846191 -8.58543366557
Type
SN Icn
Redshift
0.143
Discovery ReportClassification Report
Related AstroNotes: 2021-71, 2021-76
Reporting Group
ALeRCE
Discovering Data Source
ZTF
Discovery Date
2021-02-09 07:01:53.999
TNS AT
Y
Public
Y
Discovery Mag
19.5725
Filter
g-ZTF
Reporter/s
F. Forster, F.E. Bauer, A. Munoz-Arancibia, L. Hernandez-Garcia, G. Pignata, L. Galbany, G. Pignata, E. Camacho, J. Silva-Farfan, A. Mourao, J. Arredondo, G. Cabrera-Vives, R. Carrasco-Davis, P.A. Estevez, P. Huijse, E. Reyes, I. Reyes, P. Sanchez-Saez, C. Valenzuela, E. Castillo, D. Ruz-Mieres, D. Rodriguez-Mancini, M. Catelan, S. Eyheramendy, M.J. Graham on behalf of the ALeRCE broker
NEDSIMBADDECaLSPanSTARRS-1SkyMapperVizieRWISEDSSADS

Spectra

 ▌SN_2021ckj - 2021-02-17 02:58:56 VLT-UT1 / FORS2 (adH0cc)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

 ▌P48_ZTF-Cam_r_
 ▌P48_ZTF-Cam_g_
 ▌ATLAS-MLO_ATLAS-01_cyan_
 ▌ATLAS-HKO_ATLAS-02_cyan_
 ▌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
8985 2021-02-17 02:58:56 VLT-UT1 / FORS2 1000 service A. Floers adH0cc tns_2021ckj_2021-02-17_02-58-56_VLT-UT1_FORS2_adH0cc.asci tns_2021ckj_2021-02-17_02-58-56_VLT-UT1_FORS2_adH0cc.fits Object Quick-reduction spectrum, telluric corrections applied.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
r-ZTF P48_ZTF-Cam 2021-02-09 09:03:04 - 2021-02-09 09:03:04 2459254.8771296 - 2459254.8771296 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
191401 2021-02-09 09:03:04 2459254.8771296 19.9509 0.1389 20.5993 ABMag r-ZTF P48_ZTF-Cam 30 Robot Data provided by ZTF
g-ZTF P48_ZTF-Cam 2021-02-07 08:39:41 - 2021-02-09 07:01:54 2459252.8608912 - 2459254.7929861 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
191400 2021-02-09 07:01:54 2459254.7929861 19.5725 0.110118 20.8224 ABMag g-ZTF P48_ZTF-Cam 30 Robot Data provided by ZTF
191399 2021-02-07 08:39:41 2459252.8608912 20.7271 ABMag g-ZTF P48_ZTF-Cam 30 Robot [Last non detection] Data provided by ZTF
cyan-ATLAS ATLAS-MLO_ATLAS-01 2021-02-11 09:20:10 - 2021-02-11 09:20:10 2459256.889 - 2459256.889 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
192647 2021-02-11 09:20:10 2459256.889 19.76 ABMag cyan-ATLAS ATLAS-MLO_ATLAS-01 30 Robot [Last non detection]
cyan-ATLAS ATLAS-HKO_ATLAS-02 2021-02-13 10:37:55 - 2021-02-13 10:37:55 2459258.943 - 2459258.943 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
192648 2021-02-13 10:37:55 2459258.943 19.297 0.142 19.63 ABMag cyan-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
w-P1 PS1_GPC1 2021-02-09 09:23:02 - 2021-02-09 09:23:02 2459254.891 - 2459254.891 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
197279 2021-02-09 09:23:02 2459254.891 19.79 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 Bibcode Unreal Auto classification
102045 2021-03-11 12:02:33 PS1_Bot1 K. C. Chambers,T. de Boer,J. Bulger et al. Pan-STARRS Pan-STARRS 09:05:51.083 -08:35:07.56 2021-02-09 09:23:02.400 19.79 w-P1 PSN PS21bno Pan-STARRS N
99473 2021-02-14 21:26:37 ATLAS_Bot1 J. Tonry,L. Denneau,A. Heinze et al. ATLAS ATLAS 09:05:51.079 -08:35:07.61 2021-02-13 10:37:55.200 19.297 cyan-ATLAS PSN ATLAS21fru ATLAS N
98923 2021-02-09 19:25:21 ALeRCE F. Forster,F.E. Bauer,A. Munoz-Arancibia et al. ALeRCE ZTF 09:05:51.083 -08:35:07.57 2021-02-09 07:01:53.999 19.5725 g-ZTF PSN ZTF21aajbgol ZTF Early SN candidate (g-rise > 0.60+-0.06 mag/day, r-rise > 0.29+-0.07 mag/day) classified using ALeRCE's stamp classifier - see http://arxiv.org/abs/2008.03309 - and the public ZTF stream. Discovery image and light curve in http://alerce.online/object/ZTF21aajbgol 2021TNSTR.395....1F N
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
8975 2021-02-18 20:55:51 Stefan Taubenberger A. Pastorello (INAF Padova), C. Vogl, S. Taubenberger, A. Floers, G. Csoernyei, M. G. Cudmani, A. Holas, W. Hillebrandt, S. H. Suyu (MPA Garching), S. Blondin (CNRS, LAM), B. Leibundgut, J. Spyromilio (ESO), S. J. Smartt, M. Dobson (QUB), R. Kotak (Turku), R. Bruch, A. Gal-Yam (Weizmann), C. Lemon (Lausanne) adH0cc SN Icn 0.143 1 adH0cc An optical spectrum of SN 2021ckj, obtained on 2021 February 16 with the ESO Very Large Telescope UT1, the FORS2 spectrograph, and grism 300V, shows a blue continuum with a blackbody temperature of about 10000 K. The continuum is undulated by several broad (v > 10000 km/s) spectral lines, especially in the restframe range between 3500 and 5500 Å, reminiscent of SLSNe-I. Superimposed on this spectrum, one can find a series of narrow to intermediate-width lines (v = 1000 to 2500 km/s), some of them in emission, others exhibiting P-Cygni profiles. The lines can mostly be attributed to carbon: C III at 4650 Å and 5696 Å, and C II at 4267 Å, 5891 Å, 6580 Å and 7234 Å. He I 5875 Å is also detected. The redshift of the supernova of z = 0.143 has been measured from these narrow lines. A phase of 10d from explosion has been estimated from the combined ZTF and ATLAS light curves. With a rise time of merely a few days and a peak absolute g-band magnitude close to -20, SN 2021ckj is photometrically a fast blue optical transient (FBOT). Spectroscopically, it would be best characterised as a "Type Icn" supernova. Similarities with AT 2021csp (Perley et al., AstroNote 2021-62) should be investigated. 2021TNSCR.511....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
8985 2021-02-17 02:58:56 VLT-UT1 / FORS2 1000 service A. Floers adH0cc tns_2021ckj_2021-02-17_02-58-56_VLT-UT1_FORS2_adH0cc.asci tns_2021ckj_2021-02-17_02-58-56_VLT-UT1_FORS2_adH0cc.fits Object Quick-reduction spectrum, telluric corrections applied.

Comments

TNS
System

Thu, 03/11/2021 - 11:30

Object coordinates updated

Object coordinates updated according to AT-report 102045 of Group Pan-STARRS1
Previous RA, DEC: 09:05:51.083, -08:35:07.57 (136.46284575, -8.58543675)
Updated RA, DEC: 09:05:51.083, -08:35:07.56 (136.462846191, -8.58543366557)

Ofer
Yaron

Tue, 02/23/2021 - 10:17

Object type revised from SN I to SN Icn

Following the reporters' request, with the introduction of the new Icn classification.