SN 2020acli
RA/DEC (2000)
00:55:08.916 -37:44:19.85
13.787152 -37.738846
SN IIn-pec
Related AstroNotes: 2020-253
Reporting Group
Discovering Data Source
Discovery Date
2020-12-12 13:14:45.888
Host Name
Discovery Mag
S. Valenti, D.J.Sand, S. Wyatt, M. Lundquist, R. Amaro, J. Andrews, J. Jencson, Y. Dong, S. Davis, D. Janzen


 SN_2020acli - 2020-12-13 00:31:38 Gemini-S / GMOS-S (DLT40)z=
Show H at z=vexp= km/s
Show He at z=vexp= km/s
Show He II 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 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 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),
SelectIDObs-date (UT)Tel / InstExp-TimeObserver/sReducer/sGroupSpectrum ascii fileSpectrum fits fileSpec. TypeAssoc. GroupsEnd prop. periodRemarks
81782020-12-13 00:31:38Gemini-S / GMOS-SGemini Queue ObserverDLT40 tns_2020acli_2020-12-13_00-31-38_Gemini-S_GMOS-S_DLT40.txtObjectDLT40Quick look classification from Gemini-S GMOS spectrum.
Light Curves
FilterTel / InstObs-date rangePhotometry
Clear-Other_Other2020-12-11 03:54:36 - 2020-12-12 03:37:192
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1786092020-12-12 03:37:1918.42050.13ABMagClear-Other_Other60RobotPrompt5 0.4m
1786082020-12-11 03:54:3618.5358ABMagClear-Other_Other60Robot[Last non detection] Prompt5 0.4m
cyan-ATLASATLAS1_ACAM12020-12-10 07:32:10 - 2020-12-12 06:23:022
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
1786532020-12-12 06:23:0218.7590.14319.64ABMagcyan-ATLASATLAS1_ACAM130Robot
1786522020-12-10 07:32:1019.41ABMagcyan-ATLASATLAS1_ACAM130Robot[Last non detection]
AT Reports
IDTime received (UT)SenderReporter/sReportting groupDisc. Data SourceRADECDiscovery date (UT)Discovery Mag.FilterRelated filesAT TypeInternal nameAssoc. GroupsEnd prop. periodRemarks
926012020-12-12 16:54:04ATLAS_Bot1J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), C. Stubbs (Harvard University), K. W. Smith, S. J. Smartt, D. R. Young, S. Srivastav, O. McBrien, M. Fulton, J. Gillanders (Queen's University Belfast), T.-W. Chen (MPE), D. E. Wright (University of Minnesota), J. Anderson (ESO)ATLASATLAS00:55:08.916-37:44:19.852020-12-12 06:23:02.40018.759cyan-ATLASPSNATLAS20bhnuATLAS
925782020-12-12 13:14:48DLT40_bot1S. Valenti, D.J.Sand, S. Wyatt, M. Lundquist, R. Amaro, J. Andrews, J. Jencson, Y. Dong, S. Davis, D. JanzenDLT40DLT4000:55:08.900-37:44:19.942020-12-12 13:14:45.88818.4205Clear-PSNDLT20aaDLT40
Classification Reports
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarksADS Bibcode
81662020-12-13 07:33:08mlundquistM. Lundquist (UA), J. Andrews (UA), S. Valenti (UC-Davis), D.J.Sand (UA), S. Wyatt (UA), R. Amaro (UA), J. Jencson (UA), Y. Dong (UC-Davis), S. Davis (UC-Davis), D. Janzen (USask)DLT40SN IIn-pecDLT40A Gemini-S GMOS spectrum was taken on 2020-12-13T00:31:38, approximately 24 hours after discovery. The spectrum showed strong hydrogen balmer emission, with a P Cygni absorption feature at -4000 km/s. Using the classification software GELATO (Harutyunyan et al. 2008), the best-fitting template corresponds to the peculiar type IIn SN2009ip during the phase prior to its giant eruption. There is very little reddening towards AT2020acli, yet the absolute magnitude is several magnitudes fainter than SN 2009ip in a similar phase. Some similarity is also found with low luminosity type II SNe (e.g. SN1999br, Pastorello et al. 2004), but AT2020acli is also in this case several magnitudes fainter than low luminosity SNe IIP. 2020TNSCR3777....1L


Upon feedback from the community and our own analysis, we believe this object to be a nova in NGC300.

Instrumentation: telescope: 30cm f/8 Meade RCX400 / CCD camera: SBIG ST8-XME / stack of 5 unfiltered images with total exp 130sec

The OT was not seen to a limiting magnitude of (at least) 19.5CR at UT 2020 Dec 13.85

Object coordinates updated according to AT-report 92601 of Group ATLAS
Previous RA, DEC: 00:55:08.900, -37:44:19.94 (13.787083, -37.738872)
Updated RA, DEC: 00:55:08.916, -37:44:19.85 (13.787152, -37.738846)