J/ApJ/720/1146ivo://CDS.VizieR/J/ApJ/720/1146doi:10.26093/cds/vizier.17201146CDSLu R.-J.Hou S.-J.Liang E.-W.2017-10-16T14:57:58Z2012-08-22T12:05:58ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyA time-resolved spectral analysis for a sample of 22 intense, broad gamma-ray burst (GRB) pulses from the Compton Gamma Ray Observatory (CGRO)/BATSE GRB sample is presented. We fit the spectra with the Band function and investigate the correlation between the observed flux (F) and the peak energy (E_p_) of the {nu}f_{nu}_ spectrum in the rising and decaying phases of these pulses. Two kinds of E_p_ evolution trends, i.e., hard-to-soft (two-thirds of the pulses in our sample) and E_p_-tracing-F (one-third of the pulses in our sample), are observed in pulses from different GRBs and even from different pulses of the same burst. No dependence of spectral evolution feature on the pulse shape is found. A tight F-E_p_ positive correlation is observed in the decaying phases, with a power-law index ~2.2, which is much shallower than that expected from the curvature effect. In the rising phase, the observed F is either correlated or anti-correlated with E_p_, depending on the spectral evolution feature, and the power-law index of the correlation is dramatically different among pulses. More than 80% of the low-energy photon indices in the time-resolved spectra, whose E_p_'s are anti-correlated with F during the rising phase, violate the death line of the synchrotron radiation, disfavoring the synchrotron radiation model for these gamma rays. The F-E_p_ correlation, especially for those GRBs with E_p_-tracking-F spectral evolution, may be due to the viewing angle and jet structure effects. In this scenario, the observed F-E_p_ correlation in the rising phase may be due to the line of sight toward a structured jet (or jetter) moving from off-beam to on-beam, and both the on-beam emission and the delayed photons from high latitude of the GRB fireball contribute to the decaying phase, resulting in a shallower slope of the observed F-E_p_ correlation than that predicted by the pure curvature effect.2010ApJ...720.1146Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/720/1146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)J/ApJ/704/1405 : Testing the E_peak_-E_iso_ relation for GRBs (Krimm+, 2009)J/ApJS/166/298 : Spectral catalog of bright BATSE gamma-ray bursts (Kaneko+,J/ApJ/609/935 : Gamma-ray burst formation rate (Yonetoku+, 2004)J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/720/1146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/720/1146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/720/1146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/720/1146https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/720/1146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/720/1146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/720/1146/table2 (Power-law indices of the F{propto}E_p_^Kr(Kd)^ relation for the pulses in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/720/1146/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/720/1146/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/720/1146/table2?GETtext/xml+votable180.050000true153.856.490.0055555555555555566/7531 7624 7933 9153 10378 11454 13615 14053 14880 14983 18945 22561 26351 27200 27524 32111 37434 37722 41229 46215 47459 47512https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/720/1146?format=asciiGamma-raydefaultJ/ApJ/720/1146/table2Power-law indices of the F{propto}E_p_^Kr(Kd)^ relation for the pulses in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTrigTrigger number (1)meta.id;meta.mainintprimaryn_Trig[ht] Evolution group (2)meta.notecharKr? {kappa}_r_ value in rising phase (3)stat.fit.paramfloatnullablee_Kr? Kr uncertaintystat.errorfloatnullablerr? Correlation coefficient in rising phasestat.fit.paramfloatnullableNr? Number of the data points in rising phasemeta.numberintnullableKd? {kappa}_d_ value in decaying phase (3)stat.fit.paramfloatnullablee_Kd? Kd uncertaintystat.errorfloatnullablerd? Correlation coefficient in decaying phasestat.fit.paramfloatnullableNd? Number of the data points in decaying phasemeta.numberintnullableK06Link to bright BATSE GRBs catalogstat.fit.paramchar4BLink to 4th BATSE catalogmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from the fourth BATSE burst revised catalog (Cat. IX/20) (right ascension part)degpos.eq.ra;meta.main_DEPositions from the fourth BATSE burst revised catalog (Cat. IX/20) (declination part)degpos.eq.dec;meta.mainJ/ApJ/720/1146/table1Spectral fits with the Band functionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTrigTrigger numbermeta.id;meta.maininttstartStarting timestime.epochfloattendEnding timestime.epochfloatEpPeak energy E_p_keVphys.energyfloate_EpUncertainty in EpkeVstat.errorfloatalphaLow energy power law index {alpha}stat.fit.paramfloate_alphaUncertainty in alphastat.error;pos.eq.rafloatbetaHigh energy power law index {beta}stat.fit.paramfloate_betaUncertainty in betastat.errorfloatFluxFlux in the 30keV-10MeV band (10^-6^erg/s/cm^2^)nW.m**-2phot.fluxfloate_FluxUncertainty in FluxnW.m**-2stat.error;phot.fluxfloat