2018gv | Transient Name Server

RA/DEC (2000)

08:05:34.580 -11:26:16.87

121.394083 -11.438019

Type

SN Ia

Redshift

0.0053

Discovery Report Classification Report

Reporting Group

None

Discovering Data Source

None

Discovery Date

2018-01-15 16:21:06.000

TNS AT

Y

Public

Y

Host Name

NGC 2525

Discovery Mag

16.5

Filter

Clear-

Reporter/s

Koichi Itagaki

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

▌

Gaia_Gaia-photometric_G

▌

Other_Other_R

▌

Other_Other_Clear

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
	1648	2018-01-16 09:20:20	Keck1 / LRIS	1200	M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)	G. Dimitriadis	None	tns_2018gv_2018-01-16_09-20-20_Keck1_LRIS.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
	1653	2018-01-16 03:27:50	ESO-NTT / EFOSC2-NTT	300	M. Berton, F. Bufano	A. Floers, S. Taubenberger, C. Vogl	ePESSTO	tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.asci	tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.fits	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

G-Gaia

Gaia_Gaia-photometric

2017-11-28 10:27:50 - 2018-03-28 10:22:04

2458085.9359954 - 2458205.9319907

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
27503	2018-03-28 10:22:04	2458205.9319907	15.26	0.2		ABMag	G-Gaia	Gaia_Gaia-photometric	60	Robot
27502	2017-11-28 10:27:50	2458085.9359954			21.5	ABMag	G-Gaia	Gaia_Gaia-photometric		Robot	[Last non detection]

R-Cousins

Other_Other

2018-02-01 11:04:11 - 2018-02-01 11:04:11

2458150.9612384 - 2458150.9612384

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
25169	2018-02-01 11:04:11	2458150.9612384	13.1	0.1		VegaMag	R-Cousins	Other_Other	150	F. Watanabe	0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + CCD (SBIG STL-1001E) at Nayoro Observatory

Clear-

Other_Other

2018-01-15 16:21:06 - 2018-01-15 16:21:06

2458134.1813194 - 2458134.1813194

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
24750	2018-01-15 16:21:06	2458134.1813194	16.5		18.5	VegaMag	Clear-	Other_Other			0.5-m / f6.8
25168	2018-01-15 16:21:06	2458134.1813194	16.5			VegaMag	Clear-	Other_Other

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

18076

2018-04-29 15:28:47

Gaia_Bot1

A. Delgado,D. Harrison,S. Hodgkin et al.

GaiaAlerts

GaiaAlerts

08:05:34.580

-11:26:16.87

2018-03-28 10:22:04.000

15.26

G-Gaia

PSN

Gaia18bat

GaiaAlerts

Confirmed SN Ia near galaxy NGC2525, aka SN2018gv

N

16729

2018-02-04 04:20:38

Fumitake Watanabe

Fumitake Watanabe et al.

08:05:34.610

-11:26:16.30

2018-01-15 16:21:06.000

16.5

Clear-

1

PSN

N

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2018gv_atrep_16729.jpg		2018-03-18 08:01:56	Fumitake Watanabe

16498

2018-01-15 21:35:26

Koichi Itagaki

Koichi Itagaki et al.

08:05:34.610

-11:26:16.30

2018-01-15 16:21:06.000

16.5

Clear-

PSN

NGC 2525

2018TNSTR..57....1I

N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

1648

2018-01-16 15:46:28

ePESSTO_Bot1

M. Berton, F. Bufano, A. Floers, S. Taubenberger, C. Vogl, O. Yaron, N. Knezevic on behalf of ePESSTO

ePESSTO

SN Ia

0.0053

1

ePESSTO

2018TNSCR2076....1B

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
1653	2018-01-16 03:27:50	ESO-NTT / EFOSC2-NTT	300	M. Berton, F. Bufano	A. Floers, S. Taubenberger, C. Vogl	ePESSTO	tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.asci	tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.fits	Object

1643

2018-01-16 12:41:15

Matthew Siebert

M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)

None

SN Ia

0.005274

1

The spectrum indicates that SN 2018gv is a very young, normal Type Ia supernova. Using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024), we find a good match to several Type Ia SNe 10-15 days before maximum brightness. We note that the small number of SNe Ia observed at very early phases often results in a bias to later phases. The SN was discovered at 16.5 mag, which assuming a distance modulus of 31.1 mag for the host galaxy NGC 2525 (Tully et al., 2013, AJ, 146, 86T), corresponds to an absolute magnitude of -14.8 -- or at least 4 mag below peak brightness. This further indicates that the SN is particularly young. If the SN has minimal host reddening, it will peak at V ~ 12 mag. We measure an Si II 6355 velocity of -16,800 km/s. Similarly, we measure a C II 6580 velocity of -15,300 km/s. We detect narrow Ca H&K absorption at the host-galaxy redshift, but do not detect narrow Na D.

2018TNSCR..75....1S

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
1648	2018-01-16 09:20:20	Keck1 / LRIS	1200	M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)	G. Dimitriadis	None	tns_2018gv_2018-01-16_09-20-20_Keck1_LRIS.dat		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 18076 of Group GaiaAlerts
Previous RA, DEC: 08:05:34.610, -11:26:16.30 (121.394208, -11.437861)
Updated RA, DEC: 08:05:34.580, -11:26:16.87 (121.394083, -11.438019)

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