RA/DEC (2000)
06:31:55.004 +35:33:23.77
97.9791843379 +35.5566019315
Type
SN Ia-91bg-like
Redshift
0.027
Related AstroNotes: 2021-320
Reporting Group
ATLAS
Discovering Data Source
ATLAS
Discovery Date
2021-12-23 14:05:16.800
TNS AT
Y
Public
Y
Discovery Mag
17.7
Filter
orange-ATLAS
Reporter/s
J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii), A. Heinze, B. Stalder (LSST), A. Rest (STScI), C. Stubbs (Harvard University), K. W. Smith, S. J. Smartt, D. R. Young, S. Srivastav, M. Fulton, J. Gillanders, T. Moore, C. Richman, L. Cai (Queen's University Belfast), T.-W. Chen (Stockholm), D. E. Wright (University of Minnesota), J. Anderson (ESO)

Spectra

 SN_2021agnf - 2021-12-24 18:57:36 Lijiang-2.4m / YFOSC (None)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 PS2_GPC2_w
 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
11613 2021-12-24 18:57:36 Lijiang-2.4m / YFOSC Jujia Zhang None tns_2021agnf_2021-12-24.79_Lijiang-2.4m_YFOSC.dat Object
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
w-P1 PS2_GPC2 2022-01-10 06:47:31 - 2022-01-10 06:47:31 2459589.783 - 2459589.783 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
261175 2022-01-10 06:47:31 2459589.783 18.61 0.03 22 ABMag w-P1 PS2_GPC2 45 Robot
orange-ATLAS ATLAS-HKO_ATLAS-02 2021-12-16 13:06:14 - 2021-12-23 14:05:17 2459565.046 - 2459572.087 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
258300 2021-12-23 14:05:17 2459572.087 17.7 0.125 18.69 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
258299 2021-12-16 13:06:14 2459565.046 18.87 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot [Last non detection]
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
133788 2022-01-12 11:08:08 PS2_Bot1 K. C. Chambers,T. de Boer,J. Bulger et al. Pan-STARRS Pan-STARRS 06:31:55.004 +35:33:23.77 2022-01-10 06:47:31.200 18.61 w-P1 PSN PS22eb Pan-STARRS N
131439 2021-12-24 00:40:39 ATLAS_Bot1 J. Tonry,L. Denneau,H. Weiland (IfA et al. ATLAS ATLAS 06:31:55.014 +35:33:23.69 2021-12-23 14:05:16.800 17.7 orange-ATLAS PSN ATLAS21bnlq ATLAS 2021TNSTR4200....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
11559 2021-12-25 02:20:27 Jujia Zhang Qian Zhai, Jujia Zhang (YNAO); Xiaofeng Wang (THU) None SN Ia-91bg-like 0.027 1 The spectrum matches the SNe Ia-91bg-like at a few days before the maximum(e.g., SN 1999by at t =-4d via SNID). 2021TNSCR4210....1Z
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
11613 2021-12-24 18:57:36 Lijiang-2.4m / YFOSC Jujia Zhang None tns_2021agnf_2021-12-24.79_Lijiang-2.4m_YFOSC.dat Object

Comments

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 133788 of Group Pan-STARRS1
Previous RA, DEC: 06:31:55.014, +35:33:23.69 (97.9792255556, +35.55658)
Updated RA, DEC: 06:31:55.004, +35:33:23.77 (97.9791843379, 35.5566019315)

Jujia
Zhang

The phase of the classification spectrum is around the peak

 Cross-correlation with the library of supernova spectra using the comparison tool SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches SN 1991bg at t = +3 days at the given redshift = 0.023 of the host galaxy CGCG 175-003.