J/A+A/573/A81ivo://CDS.VizieR/J/A+A/573/A81doi:10.26093/cds/vizier.35730081CDSYu H.-F.Greiner J.van Eerten H.Burgess M.J.Bhat P.N.Briggs M.S.,Connaughton V.Diehl R.Goldstein A.Gruber D.Jenke P.A.,von Kienlin A.Kouveliotou C.Paciesas W.S.Pelassa V.Preece R.D.,Roberts O.J.Zhang B.-B.2018-01-12T08:35:32Z2015-03-11T14:29:59ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyWe study the time-resolved spectral properties of energetic gamma-ray bursts (GRBs) with good high-energy photon statistics observed by the Gamma-Ray Burst Monitor (GBM) onboard the Fermi Gamma-Ray Space Telescope. We aim to constrain in detail the spectral properties of GRB prompt emission on a time-resolved basis and to discuss the theoretical implications of the fitting results in the context of various prompt emission models. Our sample comprises eight GRBs observed by the Fermi GBM in its first five years of mission, with 1keV-1MeV fluence f>1.0x10^-4^erg/cm2 and a signal-to-noise ratio level of S/N>=10.0 above 900keV. We performed a time-resolved spectral analysis using a variable temporal binning technique according to optimal S/N criteria, resulting in a total of 299 time-resolved spectra. We performed Band function fits to all spectra and obtained the distributions for the low-energy power-law index {alpha}, the high-energy power-law index {beta}, the peak energy in the observed {nu}F_{nu}_ spectrum E_p_, and the difference between the low- and high-energy power-law indices {Delta}s={alpha}-{beta}. We also applied a physically motivated synchrotron model, which is a triple power-law with constrained power-law indices and a blackbody component, to test the prompt emission for consistency with a synchrotron origin and obtain the distributions for the two break energies E_b,1_ and E_b,2_, the middle segment power-law index {beta}, and the Planck function temperature kT.2015A&A...573A..81Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/573/A81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/199/18 : The Fermi GBM catalog (Paciesas+, 2012)J/ApJS/207/39 : IPN supplement to the Fermi GBM (Hurley+, 2013)J/ApJS/211/13 : The second Fermi/GBM GRB catalog (4yr) (von Kienlin+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/573/A81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/573/A81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/573/A81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/573/A81https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/573/A81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/573/A81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/573/A81/table1 (The names, GBM trigger numbers, durations, fluence, detectors used, and optimal S/N for the eight bursts studied in this paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A81/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A81/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A81/table1?GETtext/xml+votable180.050000true264.938583327.32447220.0055555555555555566/4228 8071 23576 28555 28959 32646 34619 44617https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/573/A81?format=asciiGamma-raydefaultJ/A+A/573/A81/table1The names, GBM trigger numbers, durations, fluence, detectors used, and optimal S/N for the eight bursts studied in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB name (YYMMDDA)meta.id;meta.maincharTrigGBM Trigger number (YYMMDD.ddd)meta.iddoubleT90Durationstime.durationfloate_T90rms uncertainty on T90sstat.errorfloatFluence1keV-1MeV fluence1e-07J.m**-2phot.fluence;em.gamma.hardfloate_Fluencerms uncertainty on Fluence1e-07J.m**-2stat.error;phot.fluencefloatNaINaI detector(s) usedmeta.id;instrcharBGOBGO detector usedmeta.id;instrcharS/N[20/50] Optimal signal-to-noise ratiostat.snrintTableName of the table with band parametersmeta.id;instr.bandpass;meta.tablecharprimarySimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/573/A81/bandBAND parameters for the {gamma}-ray bursts studiedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTableSimbad column added by the CDSmeta.id;meta.datasetchartstartStarting time relative to the GBM trigger time T0stime.epochfloattstopStop time relative to the GBM trigger time T0stime.epochfloatl_ALimit flag on Ameta.code.errorcharANormalization factor at 100keV (1)ph.s**-1.cm**-2.keV**-1stat.fit.paramfloate_A? rms uncertainty on Aph.s**-1.cm**-2.keV**-1stat.errorfloatnullablel_EpLimit flag on Epmeta.code.errorcharEpPeak energy E_p_ (1)keVem.energyfloate_Ep? rms uncertainty on EpkeVstat.errorfloatnullablel_alphaLimit flag on alphameta.code.error;pos.eq.racharalphaLow-energy power-law index {alpha} (1)spect.indexfloate_alpha? rms uncertainty on alphastat.error;pos.eq.rafloatnullablel_betaLimit flag on betameta.code.errorcharbetaHigh-energy power-law index {beta} (1)spect.indexfloate_beta? rms uncertainty on betastat.errorfloatnullableCSTATCastor C-statistics value (good match for low values, <1000)stat.fit.paramdoubledof[239/478] Degrees of freedomstat.fit.dofint