SN 2018zd
RA/DEC (2000)
06:18:03.18 +78:22:00.90
94.51325 +78.366917
Discovery Date
2018-03-02 11:40:16
Host Name
NGC 2146
Discovery Mag
Koichi Itagaki
 2018-03-06 08:57:00 FTN / FLOYDS-N (Global SN Project)
 2018-03-06 03:41:17 P60 / SED-Machine (ZTF)
 2018-03-06 03:41:17 P60 / SED-Machine (ZTF)
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   Binning factor: (rounded to nearest integer >1)
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See separate spectra
IDObs-date (UT)Tel / InstExp-TimeObserver/sReducer/sGroupSpectrum ascii fileSpectrum fits fileSpec. TypeAssoc. GroupsEnd prop. periodRemarks
17682018-03-06 08:57:00FTN / FLOYDS-N3600RoboticG. HosseinzadehGlobal SN Project tns_2018zd_2018-03-06_08-57-00_FTN_FLOYDS-N_Global_SN_Project.ascii tns_2018zd_2018-03-06_08-57-00_FTN_FLOYDS-N_Global_SN_Project.fitsObjectGlobal SN Project
17662018-03-06 03:41:17P60 / SED-Machine2700Walters/Neill/BlagorodnovaNeillZTF tns_2018zd_2018-03-06_03-41-17_P60_SED-Machine_ZTF_0.txtObjectZTFre-upload to change classification
17652018-03-06 03:41:17P60 / SED-Machine2700Walters/Neill/BlagorodnovaNeillZTF tns_2018zd_2018-03-06_03-41-17_P60_SED-Machine_ZTF.txtObjectZTF
Light Curves
FilterTel / InstObs-date rangePhotometry
Clear-Other_Other2018-03-02 11:40:16 - 2018-03-02 11:40:162
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
259892018-03-02 11:40:1617.8VegaMagClear-Other_Other
257632018-03-02 11:40:1617.8VegaMagClear-Other_OtherK.Itagaki0.5-m f6.8
R-CousinsOther_Other2018-03-10 10:56:00 - 2018-03-10 10:56:001
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
259902018-03-10 10:56:0013.7VegaMagR-CousinsOther_OtherF.Watanabe0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + CCD (SBIG STL-1001E) at Nayoro Observatory
orange-ATLASATLAS1_ACAM12018-02-21 10:39:21 - 2018-03-07 05:58:332
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
259542018-03-07 05:58:3314.2290.00719.42ABMagorange-ATLASATLAS1_ACAM130Robot
259532018-02-21 10:39:2118.51ABMagorange-ATLASATLAS1_ACAM130Robot[Last non detection]
G-GaiaGaia_Gaia-photometric2018-02-11 20:16:48 - 2018-03-05 08:09:362
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
258822018-03-05 08:09:3614.840.2ABMagG-GaiaGaia_Gaia-photometric60Robot
258812018-02-11 20:16:4821.5ABMagG-GaiaGaia_Gaia-photometricRobot[Last non detection]
AT Reportings
IDTime received (UT)SenderReporter/s (Discoverer/s)GroupRADECDiscovery date (UT)Discovery Mag.FilterRelated filesAT TypeInternal nameAssoc. GroupsEnd prop. periodRemarks
172152018-03-10 12:45:12Fumitake WatanabeFumitake Watanabe06:18:03.18+78:22:00.902018-03-02 11:40:1617.8Clear-PSN
Related files
FileFile TypeCommentsLast Modified (UT)Modified By
tns_2018zd_atrep_17215.jpgGraphics2018-03-18 08:03:16Fumitake Watanabe
171982018-03-09 12:00:02ATLAS_Bot1J. Tonry, B. Stalder, L. Denneau, A. Heinze, H. Weiland (IfA, University of Hawaii), A. Rest (STScI), K.W. Smith, S. J. Smartt, M. Fulton, O. McBrien (Queen's University Belfast)ATLAS06:18:03.21+78:22:01.002018-03-07 05:58:3314.229orange-ATLASPSNATLAS18mixATLAS
171582018-03-07 12:17:20Gaia_Bot1A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts teamGaiaAlerts06:18:03.19+78:22:01.162018-03-05 08:09:3614.84G-GaiaPSNGaia18anrGaiaAlertsbright confirmed SN IIn near galaxy NGC2146, aka SN2018zd
170892018-03-02 12:42:43K.ItagakiKoichi Itagaki06:18:03.18+78:22:00.902018-03-02 11:40:1617.8Clear-PSN
Classification Reportings
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarks
17632018-03-06 19:21:14iairIair Arcavi, Griffin Hosseinzadeh, Daichi Hiramatsu, Curtis McCully, D. Andrew Howell, Jaime Burke (UCSB/LCO)Global SN ProjectSN II0.002979Global SN ProjectWe report a FLOYDS spectrum obtained on 2018-03-06.4 UT with the robotic FLOYDS instrument mounted on the Las Cumbres Observatory 2-meter telescope on Haleakala, Hawai'i, in order to correct a previous classification of this object as a Type Ia-CSM supernova. The added resolution of the FLOYDS data compared to the spectrum reported previously clearly reveals the presence of narrow Balmer H emission lines atop a blue continuum, consistent with a young Type II supernova. Additional narrow emission features include He II 4686A and 5411A, C III 4648A, C IV 5801A, O III 3713A and 3749A, and possibly N III 4640A, similar to those seen in very early "flash spectra" of young Type II supernovae (e.g. Gal-Yam et al. 2014, Nature, 509, 471; Khazov et al. 2016, ApJ, 818, 3; Hosseinzadeh et al. 2018, arXiv: 1801.00015), and in early spectra of the peculiar Type II SN 1998S (e.g. Shivvers et al. 2015, ApJ, 806, 213). It is therefore still too early to classify this event as a Type IIn supernova (or as any other subcategory of the Type II class).
17612018-03-06 14:56:29neillJames NeillZTFSN IIn0.002ZTFClassification provided by Saurab Jha from SNID fit to SN1998S at -13 days
17602018-03-06 05:49:56neillJames NeillZTFSN Ia-CSM0.003ZTFSNID match to SN2005gj at +10 days


I agree with Dr. Yaron -- the P60 SED machine spectrum fits very nicely with the type IIn SN 1998S at early times, see attached from SNID.

but a type II Core-Collapse SN. 

Image was taken 2018-03-02 at 02:24:37, about 9.5 hours before the discovery image. Limiting magnitude was about 18.5. No apparent sign of anything new at that time.