2018cow | Transient Name Server

RA/DEC (2000)

16:16:00.220 +22:16:04.91

244.000917 +22.268031

Type

SN Ic-BL

Redshift

0.014

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2018-06-16 10:35:02.000

TNS AT

Public

Discovery Mag

14.739

Filter

orange-ATLAS

Reporter/s

J. Tonry, B. Stalder, L. Denneau, A. Heinze, H. Weiland (IfA, University of Hawaii), A. Rest (STScI), K. W. Smith, S. J. Smartt, D. R. Young, M. Fulton, O. McBrien, D. O'Neill, P. Clark (Queen's University Belfast)

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

P48_ZTF-Cam_r

▌

Gaia_Gaia-photometric_G

▌

ATLAS-MLO_ATLAS-01_orange

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	Spec. Type	End prop. period
	5903	2018-07-12 09:31:58	Keck1 / LRIS	1800	Christoffer Fremling, Yashvi Sharma	Christoffer Fremling	None	tns_2018cow_2018-07-12_09-31-58_Keck1_LRIS.txt	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
	3343	2018-07-12 09:31:58	Keck1 / LRIS	1800.01	Christoffer Fremling, Yashvi Sharma	Christoffer Fremling	None	tns_2018cow_2458311.89720_Keck1_LRIS.txt	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
	2187	2018-06-21 04:42:43	P60 / SEDM	2500	SEDmRobot	Don Neill	ZTF	tns_2018cow_2018-06-21_04-42-43_P60_SED-Machine_ZTF.ascii	Object	2021-06-22
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

r-ZTF

P48_ZTF-Cam

2018-06-13 07:35:02 - 2018-06-22 06:34:33

2458282.8159954 - 2458291.7739931

Photometry

ID	Obs-date	JD	Mag. / Flux	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
30570	2018-06-22 06:34:33	2458291.7739931	15.16		ABMag	r-ZTF	P48_ZTF-Cam	30	ZTF
30569	2018-06-19 07:09:07	2458288.7979977	14.2		ABMag	r-ZTF	P48_ZTF-Cam	30	ZTF
30568	2018-06-13 07:35:02	2458282.8159954		20.22	ABMag	r-ZTF	P48_ZTF-Cam	30	ZTF	[Last non detection]

G-Gaia

Gaia_Gaia-photometric

2018-05-02 18:25:55 - 2018-06-22 16:46:33

2458241.2679977 - 2458292.1989931

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
30781	2018-06-22 16:46:33	2458292.1989931	15.21	0.2		ABMag	G-Gaia	Gaia_Gaia-photometric	60	Robot
30780	2018-05-02 18:25:55	2458241.2679977			21.5	ABMag	G-Gaia	Gaia_Gaia-photometric		Robot	[Last non detection]

orange-ATLAS

ATLAS-MLO_ATLAS-01

2018-06-12 11:45:36 - 2018-06-16 10:35:02

2458281.99 - 2458285.9409954

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
30213	2018-06-16 10:35:02	2458285.9409954	14.739	0.009	19.37	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot
30212	2018-06-12 11:45:36	2458281.99			19.35	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	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	AT Type	Internal name	Assoc. Groups	Remarks	ADS Bibcode	Unreal
19758	2018-06-29 14:32:20	Gaia_Bot1	A. Delgado, D. Harrison, S. Hodgkin et al.	GaiaAlerts	GaiaAlerts	16:16:00.220	+22:16:04.91	2018-06-22 16:46:33.000	15.21	G-Gaia	PSN	Gaia18bqa	GaiaAlerts	confirmed SN Ic-BL SN 2018cow		N
19664	2018-06-22 20:48:26	ZTF_Bot1	C. Fremling (Caltech) on behalf of the Zwicky Transient Facility (ZTF) collaboration	ZTF	ZTF	16:16:00.227	+22:16:04.88	2018-06-19 07:09:07.000	14.2	r-ZTF	PSN	ZTF18abcfcoo	ZTF			N
19482	2018-06-17 15:23:22	ATLAS_Bot1	J. Tonry, B. Stalder, L. Denneau et al.	ATLAS	ATLAS	16:16:00.223	+22:16:04.83	2018-06-16 10:35:02.000	14.739	orange-ATLAS	PSN	ATLAS18qqn	ATLAS		2018TNSTR.838....1T	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

5895

2020-01-14 18:02:15

Anna Ho

None

Other

0.014

Not classified as any particular SN type

2020TNSCR1480....1H

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
5903	2018-07-12 09:31:58	Keck1 / LRIS	1800	Christoffer Fremling, Yashvi Sharma	Christoffer Fremling	None	tns_2018cow_2018-07-12_09-31-58_Keck1_LRIS.txt		Object

3335

2018-12-31 09:13:50

Anna Ho

Anna Ho (Caltech), Dan Perley (LJMU)

None

Other

0.014

Unknown Classification

2018TNSCR2189....1H

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
3343	2018-07-12 09:31:58	Keck1 / LRIS	1800.01	Christoffer Fremling, Yashvi Sharma	Christoffer Fremling	None	tns_2018cow_2458311.89720_Keck1_LRIS.txt		Object

2180

2018-06-22 23:58:53

ZTF_Bot1

C. Fremling, Y. Sharma (Caltech) on behalf of the Zwicky Transient Facility (ZTF)

ZTF

SN Ic-BL

ZTF

2018TNSCR.873....1F

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
2187	2018-06-21 04:42:43	P60 / SEDM	2500	SEDmRobot	Don Neill	ZTF	tns_2018cow_2018-06-21_04-42-43_P60_SED-Machine_ZTF.ascii		Object		2021-06-22

Comments

Object coordinates updated

Object coordinates updated according to AT-report 19758 of Group GaiaAlerts
Previous RA, DEC: 16:16:00.223, +22:16:04.83 (244.000927647, +22.2680094118)
Updated RA, DEC: 16:16:00.220, +22:16:04.91 (244.000917, 22.268031)

Classification of AT2018cow

Despite intense multiwavelength examination, the nature of AT2018cow remains unknown. Its rapid evolution and location in the spiral arm of a star-forming galaxy suggests a massive-star origin. However, the UVOIR spectra resemble those predicted for a tidal disruption event: the disruption of a main sequence star or a white dwarf by an intermediate-mass black hole (Kuin et al. 2018; Perley et al. 2018). The luminous radio and millimeter emission, together with luminous and highly-variable X-ray emission, suggest continuous energy injection by an accreting black hole or a highly-magnetized neutron star (Margutti et al. 2018; Ho et al. 2018). This could happen both in a supernova, and in a tidal disruption event. Therefore, I would recommend changing the type to "AT2018cow" from "SN2018cow," and removing the Ic-BL classification.

Lighturves(Johnson V) of SN2018cow

We observed SN2018cow from 2018-7-22 to 2018-8-5

2018cow-V.png

SN 2018cow

We observed SN 2018cow on 2018cow on 2018-07-18.035

V = 17.97 +/- 0.09

Cheers,
Malhar R. Kendurkar

2018cow_1.png

LC of AT 2018cow

Light Curves of AT 2018cow from 2018-06-18 to 2018-07-17

Cheers,
Malhar R. Kendurkar

LC_cow.png

AT 2018cow: 06/26/2018 from Caceres (Spain).

AT 2018cow taken last night (06/26/2018) from Caceres (Spain).

Sin título.tif

Light curve of SN 2018cow

Light curve (23 points) of SN 2018cow in V band taken from Cáceres (Spain).

Curva V.TIF

SN 2018cow (06/25/2018)

AT 2018cow taken last night (06/25/2018) from Caceres (Spain).

Ccow1.tif

SN 2018cow

Follow up observations of SN 2018cow on 2018-06-23.
R = 14.66 +/- 0.01

2018cow.tiff

Transient AT 2018cow

Supernova? AT 2018cow taken last night (21-06-2018) from Caceres (Spain). HJD: 2458290.61348 ; magnitude V: 14.550 +/- 0.012 ; S/N: 90

Cow21.tif

SN 2018cow Type Ic?

Observations of SN 2018cow on 2018-06-20.016 from Teide Observatory, Spain.
R = 14.2 +/- 0.2

SN 2018cow.png

2018cow and PGC57660

Transient 2018cow, PGC57660 and stars.

Cow1.JPG

2018cow and PGC57660

Transient 2018cow and the galaxy PGC57660, 20-06-2018: magnitude 13.95 V.

Cow2.JPG

AT 2018cow

Observations of AT 2018cow on 2018-06-18.933 from Teide Observatory, Spain.
R = 13.98 +/- 0.2

AT 2018cow..png

Image

T-0.51m f/4 , CCD ST9XE , exp 1x6" , Observatory L'Ametlla del Vallès (Spain) . Antonio Garrigós Sánchez, R13.9 2018 06 18.94657
Johnson B 13.6
Johnson V 13.8
Johnson R 13.9
Johnson I 14.6

Rectification

Johnson I 14.6

Image

T-0.51m f/4 , CCD ST9XE , exp 1x6" , Observatory L'Ametlla del Vallès (Spain) . Antonio Garrigós Sánchez, R13.9 2018 06 18.94657
Johnson B 13.6
Johnson V 13.8
Johnson R 13.9
Johnson V 14.6

AT 2018cow imagen.jpg

Fotometria B_V_R_I

Observaroy L' Ametlla del Vallés (Spain) T-0.51m , CCD ST9XE ,
In the temporal window of the observations, no variation is observed within 0.012 mag.

AT 2018cow.jpg

Spectrum: very blue

This morning (19-06-2018) I have taken some spectra of the object: it is very blue and seems to continue around the magnitude determined yesterday. I can appreciate a strong asymmetry in its spectral profile: in the Spectral Distribution of Energy the maximum is in the blue sector, as can be seen in the attached image.

Espectro.TIF

Confirmation image AT2018cow

Image taken by Victor R. Ruiz using the remote T5 iTelescope (USA) shows the transient very bright at 13,71 V mag. Attached image and photometry report.

Calibrated-T05-vrruiz-sn2018cow-20180617-043915-V-BIN1-W-060-001.fit
2458287.94442 20180618.44442
Johnson V
Calibration Stars from UCAC4 (V)

C CAL-1 14982 12.46 22.95
C CAL-2 38518 11.37 22.89
V VAR-1 4644 13.71

*** Resumen ***
VAR-1 2458287.94442 20180618.44442 13.71 Johnson V

2018cow rvr.png