J/ApJ/826/37ivo://CDS.VizieR/J/ApJ/826/37doi:10.26093/cds/vizier.18260037CDSJenke P.A.Wilson-Hodge C.A.Homan J.Veres P.Briggs M.S.Burns E.,Connaughton V.Finger M.H.Hui M.2017-01-23T22:00:00Z2016-10-21T13:56:58ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsV404 Cygni was discovered in 1989 by the Ginga X-ray satellite during its only previously observed X-ray outburst and soon after confirmed as a black hole binary. On 2015 June 15, the Gamma-ray Burst Monitor (GBM) triggered on a new outburst of V404 Cygni. We present 13 days of GBM observations of this outburst, including Earth occultation flux measurements and spectral and temporal analysis. The Earth occultation fluxes reached 30 Crab with detected emission to 100keV and determined, via hardness ratios, that the source was in a hard state. At high luminosity, spectral analysis between 8 and 300keV showed that the electron temperature decreased with increasing luminosity. This is expected if the protons and electrons are in thermal equilibrium during an outburst with the electrons cooled by the Compton scattering of softer seed photons from the disk. However, the implied seed photon temperatures are unusually high, suggesting a contribution from another source, such as the jet. No evidence of state transitions is seen during this time period. The temporal analysis reveals power spectra that can be modeled with two or three strong, broad Lorentzians, similar to the power spectra of black hole binaries in their hard state.2016ApJ...826...37Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/826/37CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/587/A61 : BlackCAT, stellar-mass BH in X-ray trans. (Corral-Santana+,J/BaltA/24/395 : X-ray and radio sources in binaries (Malkov+, 2015)J/ApJS/218/11 : The 5yr Fermi/GBM magnetar burst catalog (Collazzi+, 2015)J/ApJS/216/32 : Localizations of GRBs with Fermi GBM (Connaughton+, 2015)J/ApJ/800/17 : Mass-transfer sequences in 16 Galactic LMXBs (Fragos+, 2015)J/A+A/564/A107 : Galactic ridge X-ray emission (Molaro+, 2014)J/A+A/469/807 : Catalogue of Galactic low-mass X-ray binaries (Liu+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/826/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/826/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/826/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/826/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/826/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/826/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/826/37/table2V404 Cyg spectral modeling resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEvent numbermeta.id;meta.mainlongDur[8/726] Event selection durationstime.durationintSpInd[0.06/1.7] Spectral index of cut-off powerlaw model \fg{grey50}(Upper limit value in grey)spect.index;meta.modelledfloate_SpInd? Uncertainty in SpInd (1)stat.errorfloatnullableEcut[7.5/148.2] Cut-Off energy of cut-off powerlaw modelkeVem.energyfloate_EcutUncertainty in EcutkeVstat.errorfloatcutLum[3/76.4] Cut-off powerlaw model 10-1e3keV luminosity (2)1e+30Wstat.paramfloate_cutLumUncertainty in cutLum1e+30Wstat.errorfloatcutRChi[0.8/2.4] Reduced {Chi}^2^ of cut-off powerlaw modelstat.fit.chi2floatref[1] Reflect*COMPTT model, fixed at Omega/2{pi}stat.paramfloatrefkT[7.4/321] Reflect*COMPTT model electron temp \fg{grey50}(Upper limit value in grey)keVphys.temperature;phys.electronfloate_refkT? Uncertainty in refkT (1)keVstat.errorfloatnullablerefT0[1] Reflect*COMPTT model, fixed photon seed tempkeVstat.paramfloatrefTau[0.1/110] Reflect*COMPTT model Optical Depth \fg{grey50}(Upper limit value in grey)phys.absorption.opticalDepthfloate_refTau? Uncertainty in refTau (1)stat.errorfloatnullablerefLum[3.6/75.6] Reflect*COMPTT model 10-1e3keV luminosity (2)1e+30Wstat.paramfloate_refLumUncertainty in refLum1e+30Wstat.errorfloatrefChi[0.8/2.5] Reduced {Chi}^2^ of Reflect*COMPTT modelstat.fit.chi2floatkT[10.9/3378] COMPTT model Electron temp \fg{grey50}(Upper limit value in grey)keVphys.temperature;phys.electronfloate_kT? Uncertainty in kT (1)keVstat.error;phys.energyfloatnullableT0[1.9/11] COMPTT model photon seed temp \fg{grey50}(Upper limit value in grey)keVstat.paramfloate_T0? Uncertainty in T0 (1)keVstat.errorfloatnullableTau[0.05/16] COMPTT model optical depth \fg{grey50}(Upper limit value in grey)phys.absorption.opticalDepth;meta.modelledfloate_Tau? Uncertainty in Tau (1)stat.errorfloatnullableLum[3.6/77.2] COMPTT model 10-1e3keV luminosity (2)1e+30Wstat.paramfloate_LumUncertainty in Lum1e+30Wstat.errorfloatRChi[0.8/2.1] Reduced {Chi}^2^ of COMPTT modelstat.fit.chi2float