AT 2017gfo
RA/DEC (2000)
13:09:48.09 -23:22:53.35
197.450371 -23.381486
Type
Kilonova
Redshift
0.00984
Source Group
Swope SN Survey
Discovery Date
2017-08-17 23:31:12
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
Discoverer/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)
 2017-08-18 23:20:00 ESO-NTT / EFOSC2-NTT (ePESSTO)
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Spectra
IDObs-date (UT)Tel / InstExp-TimeObserver/sReducer/sGroupSpectrum ascii fileSpectrum fits fileSpec. TypeAssoc. GroupsEnd prop. periodRemarks
12192017-08-18 23:20:00ESO-NTT / EFOSC2-NTT2700J. Lyman, D. HomanM. FraserePESSTO tns_2017gfo_2017-08-18_23-20-00_ESO-NTT_EFOSC2-NTT_ePESSTO.txtObjectePESSTO2017-10-16The 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
FilterTel / InstObs-date rangePhotometry
Clear-Other_Other2017-07-27 23:52:48 - 2017-08-17 23:48:282
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
197902017-08-17 23:48:2817.33350.06ABMagClear-Other_Other60RobotPrompt5 0.4m
197892017-07-27 23:52:4819.676ABMagClear-Other_Other60Robot[Last non detection] Prompt5 0.4m
i-SloanOther_Other2017-08-17 23:31:12 - 2017-08-17 23:31:121
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
196302017-08-17 23:31:1217.3ABMagi-SloanOther_OtherSwope Telescope
y-PS1PS1_GPC12017-08-18 05:34:04 - 2017-08-18 05:34:041
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
203112017-08-18 05:34:0417.280.1318.3ABMagy-PS1PS1_GPC130Robot
AT Reportings
IDTime received (UT)SenderReporter/s (Discoverer/s)GroupRADECDiscovery date (UT)Discovery Mag.FilterRelated filesAT TypeInternal nameAssoc. GroupsEnd prop. periodRemarks
135882017-09-11 08:43:46PS1_Bot1K. 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-STARRS113:09:48.08-23:22:53.282017-08-18 05:34:0417.28y-PS1PSNPS17eglPan-STARRS12017-10-17
132832017-08-29 06:08:52DLT40_bot1S. Valenti, D.J.Sand, L. TartagliaDLT4013:09:48.08-23:22:53.332017-08-17 23:48:2817.3335Clear-PSNDLT17ckDLT402017-10-17
131952017-08-20 18:27:47rfoleyD. 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 Survey13:09:48.09-23:22:53.352017-08-17 23:31:1217.3i-SloanPSNSSS17aSwope SN Survey2017-10-16Transient associated with LIGO/Virgo trigger G298048.
Classification Reportings
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarks
12152017-09-16 15:59:59sjsmartt 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)ePESSTOKilonova0.00984ePESSTO2017-10-16Classified 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.

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