2021bxu | Transient Name Server

RA/DEC (2000)

02:09:16.455 -23:24:45.40

32.3185608926 -23.4126115112

Type

SN IIb

Redshift

0.0178

Discovery Report Classification Report

Related AstroNotes: 2021-55

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2021-02-06 06:38:52.800

TNS AT

Y

Public

Y

Discovery Mag

17.23

Filter

cyan-ATLAS

Reporter/s

J. 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)

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

ATLAS-MLO_ATLAS-01_cyan

▌

ATLAS-HKO_ATLAS-02_orange

▌

PS1_GPC1_y

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	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
	8884	2021-02-08 01:41:48	APO-3.5m / DIS	2400	J. DerKacy	J. DerKacy	POISE	tns_2021bxu_2021-02-08_01-41-48.018_APO-3.5m_DIS_POISE.dat		Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

cyan-ATLAS

ATLAS-MLO_ATLAS-01

2021-02-06 06:38:53 - 2021-02-06 06:38:53

2459251.777 - 2459251.777

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
190224	2021-02-06 06:38:53	2459251.777	17.23	0.051	19.41	ABMag	cyan-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot

orange-ATLAS

ATLAS-HKO_ATLAS-02

2021-01-31 06:25:55 - 2021-01-31 06:25:55

2459245.768 - 2459245.768

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
190223	2021-01-31 06:25:55	2459245.768			19.28	ABMag	orange-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot	[Last non detection]

y-P1

PS1_GPC1

2021-02-12 05:34:05 - 2021-02-12 05:34:05

2459257.732 - 2459257.732

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
192595	2021-02-12 05:34:05	2459257.732	18.68	0.27	18.3	ABMag	y-P1	PS1_GPC1	60	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
99443	2021-02-14 04:57:38	PS1_Bot1	K. C. Chambers,T. de Boer,J. Bulger et al.	Pan-STARRS	Pan-STARRS	02:09:16.455	-23:24:45.40	2021-02-12 05:34:04.800	18.68	y-P1		PSN		PS21abl	Pan-STARRS				N
98491	2021-02-06 11:30:01	ATLAS_Bot1	J. Tonry,L. Denneau,A. Heinze et al.	ATLAS	ATLAS	02:09:16.467	-23:24:45.15	2021-02-06 06:38:52.800	17.23	cyan-ATLAS		PSN		ATLAS21dov	ATLAS			2021TNSTR.360....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

8874

2021-02-12 00:40:14

James DerKacy

James DerKacy (Oklahoma), on behalf of POISE

POISE

SN IIb

0.0178

1

POISE

We report the classification of SN2021bxu as a 1993J-like Type IIb supernova in ESO 478 - G 006 (z = 0.017786, DM = 34.06). Classification with DASH (Muthukrishna et al. 2019, ApJ, 885, 85) suggests that SN 2021bxu is a Type IIb between -18 and -14 days with >99.9% probability. SN 2021bxu shows spectroscopic similarities to spectra SN 1993J at -16.7 days and SN 2011fu at -14.0 days, suggesting that the supernova is still in the shock cooling phase. Further follow-up is encouraged.

2021TNSCR.447....1D

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
8884	2021-02-08 01:41:48	APO-3.5m / DIS	2400	J. DerKacy	J. DerKacy	POISE	tns_2021bxu_2021-02-08_01-41-48.018_APO-3.5m_DIS_POISE.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 99443 of Group Pan-STARRS1
Previous RA, DEC: 02:09:16.467, -23:24:45.15 (32.318611, -23.412541)
Updated RA, DEC: 02:09:16.455, -23:24:45.40 (32.3185608926, -23.4126115112)

Log in or register to post comments

Log in or register to post comments