AT 2017gfo | Transient Name Server

AT 2017gfo

RA/DEC (2000)

13:09:48.082 -23:22:53.28

197.450341598 -23.3814675445

Type

Kilonova

Redshift

0.00984

Discovery Report Classification Report

Reporting Group

Swope SN Survey

Discovering Data Source

Swope SN Survey

Discovery Date

2017-08-17 23:31:12.000

TNS AT

Y

Public

Y

End Prop. Period

2017-10-16

Host Name

NGC 4993

Host Redshift

0.009727

Discovery Mag

17.3

Filter

i-Sloan

Reporter/s

D. A. Coulter, C. D. Kilpatrick, M. R. Siebert, R. J. Foley (UCSC), B. J. Shappee, M. R. Drout, J. S. Simon, and A. L. Piro (Carnegie), A. Rest (STScI)

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

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
	1219	2017-08-18 23:20:00	ESO-NTT / EFOSC2-NTT	2700	J. Lyman, D. Homan	M. Fraser	ePESSTO	tns_2017gfo_2017-08-18_23-20-00_ESO-NTT_EFOSC2-NTT_ePESSTO.txt		Object	ePESSTO	2017-10-16	The observations were performed on the ESO New Technology Telescope at La Silla with the EFOSC2 instrument in spectroscopic mode starting from 2018-08-18 at 23:20 UT, using the Gr11 and Gr16 which provide coverage 3345-9995 at a resolution between 260-396 (v = 1150 - 756 km/s) for a 1.5" slit, which was used in roughly 1.5-2.0" seeing. This spectrum is fully reduced and corrected to r-band photometry.
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 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 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 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 Contrib Publish Remarks The observations were performed on the ESO New Technology Telescope at La Silla with the EFOSC2 instrument in spectroscopic mode starting from 2018-08-18 at 23:20 UT, using the Gr11 and Gr16 which provide coverage 3345-9995 at a resolution between 260-396 (v = 1150 - 756 km/s) for a 1.5" slit, which was used in roughly 1.5-2.0" seeing. This spectrum is fully reduced and corrected to r-band photometry.

Light Curves

Filter

Tel / Inst

Obs-date range

Photometry

Clear-

Other_Other

2017-07-27 23:52:48 - 2017-08-17 23:48:28

2

Photometry

ID	Obs-date	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
19790	2017-08-17 23:48:28	17.3335	0.06		ABMag	Clear-	Other_Other	60	Robot	Prompt5 0.4m
19789	2017-07-27 23:52:48			19.676	ABMag	Clear-	Other_Other	60	Robot	[Last non detection] Prompt5 0.4m

i-Sloan

Other_Other

2017-08-17 23:31:12 - 2017-08-17 23:31:12

1

Photometry

ID	Obs-date	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
19630	2017-08-17 23:31:12	17.3			ABMag	i-Sloan	Other_Other			Swope Telescope

y-PS1

PS1_GPC1

2017-08-18 05:34:04 - 2017-08-18 05:34:04

1

Photometry

ID	Obs-date	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
20311	2017-08-18 05:34:04	17.28	0.13	18.3	ABMag	y-PS1	PS1_GPC1	30	Robot

AT Reports

ID	Time received (UT)	Sender	Reporter/s	Reportting group	Disc. Data Source	RA	DEC	Discovery date (UT)	Discovery Mag.	Filter	Related files	AT Type	Internal name	Assoc. Groups	End prop. period	Remarks
13588	2017-09-11 08:43:46	PS1_Bot1	K. C. Chambers (IfA, University of Hawaii), M. E. Huber (IfA, University of Hawaii), S. J. Smartt, K. W. Smith, D. R. Young (Queen's University Belfast), M. Coughlin (Harvard), T.-W. Chen (MPE), L. Denneau, H. Flewelling, A. Heinze (IfA, University of Hawaii), E. Kankare (Queen's University Belfast), T. Lowe, E. A. Magnier (IfA, University of Hawaii), A. Rest (STScI), B. Stalder, A. S. B. Schultz (IfA, University of Hawaii), C. W. Stubbs (Harvard), J. Tonry, C. Waters, R. J. Wainscoat, H. Weiland, M. Willman (IfA, University of Hawaii), D. E. Wright (University of Minnesota)	Pan-STARRS1	Pan-STARRS1	13:09:48.082	-23:22:53.28	2017-08-18 05:34:04.000	17.28	y-PS1		PSN	PS17egl	Pan-STARRS1	2017-10-17
13283	2017-08-29 06:08:52	DLT40_bot1	S. Valenti, D.J.Sand, L. Tartaglia	DLT40	DLT40	13:09:48.080	-23:22:53.33	2017-08-17 23:48:28.000	17.3335	Clear-		PSN	DLT17ck	DLT40	2017-10-17
13195	2017-08-20 18:27:47	rfoley	D. A. Coulter, C. D. Kilpatrick, M. R. Siebert, R. J. Foley (UCSC), B. J. Shappee, M. R. Drout, J. S. Simon, and A. L. Piro (Carnegie), A. Rest (STScI)	Swope SN Survey	Swope SN Survey	13:09:48.089	-23:22:53.35	2017-08-17 23:31:12.000	17.3	i-Sloan		PSN	SSS17a	Swope SN Survey	2017-10-16	Transient associated with LIGO/Virgo trigger G298048.

Classification Reports

ID	Time received (UT)	Sender	Classifier/s	Group	Classification	Redshift	Related files	Assoc. Groups	End prop. period	Remarks	ADS Bibcode
1215	2017-09-16 15:59:59	sjsmartt	J. Lyman (Univ. of Warwick), D. Homan (Univ. of Edinburgh), K. Maguire (QUB), M. T. Botticella (INAF-Capodimonte), M. Fraser (UCD), C. Inserra (Southampton), E. Kankare, S. J. Smartt, K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron, I. Manulis (Weizmann), D. Young (QUB), T.-W. Chen (MPE), S. Campana (INAF-Brera), S. Benetti, L. Tomasella (INAF-Padova), G. Leloudas (DARK, Copenhagen), Z. Cano (IAA, Granada)	ePESSTO	Kilonova	0.00984		ePESSTO	2017-10-16	Classified in Ligo-Virgo GCN 21582 DATE: 17/08/19 01:46:26 GMT : The continuum is featureless, similar to the report of the first Magellan spectrum in Drout et al. (GCN 21547). But it peaks at 5500 and falls off rapidly in the blue. This is consistent with the Swift colours reported and the fading U-band and UV flux. The red part (beyond 5000Angs) can be fit with a black-body temperature of around 6000K or a power law. But neither are consistent with the turn over in the blue. There are no strong features in the blue that indicate line absorption or could be identified with known transitions. There are no Balmer lines, no Ca II H&K, or Si II absorption seen in supernova-like transients. We can certainly conclude this is not a young supernova of any type in this host, nor is it consistent with being a background supernova of any standard type. The UV dimming and maintaining of the red and NIR flux appears broadly consistent with many flavours of kilonova models.	2017TNSCR1127....1L

Comments

TNS System (WIS)

Sun, 06/23/2019 - 10:44

Object coordinates updated

Object coordinates updated according to AT-report 13588 of Group Pan-STARRS1
Previous RA, DEC: 13:09:48.089, -23:22:53.35 (197.450371, -23.381486)
Updated RA, DEC: 13:09:48.082, -23:22:53.28 (197.450341598, -23.3814675445)

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