AT 2017gfo
RA/DEC (2000)
13:09:48.082 -23:22:53.28
197.450341598 -23.3814675445
Reporting Group
Swope SN Survey
Discovering Data Source
Swope SN Survey
Discovery Date
2017-08-17 23:31:12.000
End Prop. Period
Host Name
NGC 4993
Host Redshift
Discovery Mag
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)


 AT_2017gfo - 2017-08-18 23:20:00 ESO-NTT / EFOSC2-NTT (ePESSTO)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)
SelectIDObs-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
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
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
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
203112017-08-18 05:34:0417.280.1318.3ABMagy-PS1PS1_GPC130Robot
AT Reports
IDTime received (UT)SenderReporter/sReportting groupDisc. Data SourceRADECDiscovery 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-STARRS1Pan-STARRS113:09:48.082-23:22:53.282017-08-18 05:34:04.00017.28y-PS1PSNPS17eglPan-STARRS12017-10-17
132832017-08-29 06:08:52DLT40_bot1S. Valenti, D.J.Sand, L. TartagliaDLT40DLT4013:09:48.080-23:22:53.332017-08-17 23:48:28.00017.3335Clear-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 SurveySwope SN Survey13:09:48.089-23:22:53.352017-08-17 23:31:12.00017.3i-SloanPSNSSS17aSwope SN Survey2017-10-16Transient associated with LIGO/Virgo trigger G298048.
Classification Reports
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarksADS Bibcode
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. 2017TNSCR1127....1L


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)