J/ApJ/824/6ivo://CDS.VizieR/J/ApJ/824/6doi:10.26093/cds/vizier.18240006CDSOfek E.O.Cenko S.B.Shaviv N.J.Duggan G.Strotjohann N.-L.Rubin A.,Kulkarni S.R.Gal-Yam A.Sullivan M.Cao Y.Nugent P.E.Kasliwal M.M.,Sollerman J.Fransson C.Filippenko A.V.Perley D.A.Yaron O.Laher R.2017-06-28T06:58:42Z2016-09-23T15:03:36ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomyWide-band photometryx-ray-sourcesThe progenitors of some supernovae (SNe) exhibit outbursts with super-Eddington luminosities prior to their final explosions. This behavior is common among SNe IIn, but the driving mechanisms of these precursors are not yet well-understood. SNHunt 275 was announced as a possible new SN during 2015 May. Here we report on pre-explosion observations of the location of this event by the Palomar Transient Factory (PTF) and report the detection of a precursor about 500 days prior to the 2015 May activity (PTF 13efv). The observed velocities in the 2015 transient and its 2013 precursor absorption spectra are low (1000-2000km/s), so it is not clear yet if the recent activity indeed marks the final disruption of the progenitor. Regardless of the nature of this event, we use the PTF photometric and spectral observations, as well as Swift-UVOT observations, to constrain the efficiency of the radiated energy relative to the total kinetic energy of the precursor. We find that, using an order-of-magnitude estimate and under the assumption of spherical symmetry, the ratio of the radiated energy to the kinetic energy is in the range of 4x10^-2^ to 3.4x10^3^.2016ApJ...824....6Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/824/6CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)II/313 : Palomar Transient Factory (PTF) photometric catalog 1.0 (Ofek+, 2012)J/ApJ/811/117 : R-band PTF observations of SNe IIb (Strotjohann+, 2015)J/ApJ/782/42 : Panchromatic observations of PTF11qcj (Corsi+, 2014)J/ApJ/781/42 : Optical photometry of SN 2010jl (Ofek+, 2014)J/ApJ/768/47 : Swift/XRT 0.2-10keV observations of SN2009ip (Ofek+, 2013)J/other/Nat/494.65 : SN 2010mc outburst before explosion (Ofek+, 2013)J/ApJ/763/L27 : RI light curves of the type IIn SN 2009ip (Prieto+, 2013)J/ApJ/702/226 : Swift/UVOT panchromatic obs. of SN 2008D (Modjaz+, 2009)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/824/6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/824/6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/824/6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/824/6https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/824/6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/824/6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticalX-raydefaultJ/ApJ/824/6/table1PTF photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleCts[-174/531] Observed countsctphot.countfloate_Cts[47/164] Error in Ctsctstat.errorfloatl_RmagLower limit flag on mag (1)meta.code.errorcharRmag[20.1/21.7] Image-subtraction-based PTF R-band AB magnitude (2)magphot.mag;em.opt.Rfloate_Rmag[0.1/0.4]? Error in Rmagmagstat.error;phot.mag;em.opt.RfloatnullableJ/ApJ/824/6/table5Swift-XRT observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintT-t0[-2686/23.3] Time since JD=2457157.36717dtime.epochdoubleExp[54/28650] Exposure timestime.duration;obs.exposurefloatSrc[0/3] Source counts in the 0.2-10keV band (1)ctphot.count;em.X-rayintBck[0/124] Background counts (0.2-10keV) (2)ctinstr.backgroundintJ/ApJ/824/6/table3Swift-UVOT photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltSwift/UVOT filter identifier (U,B,V, UM2, UW1 or UW2)meta.id;instr.filtercharT-t0[-2686/15.5] Time since JD=2457157.36717dtime.epochdoubleFlux[0.07/39] Background subtracted counts in Filt (1)ctphot.countfloate_Flux[0.006/1.8] Error in Fluxctstat.error;phot.fluxfloat