J/ApJ/756/112ivo://CDS.VizieR/J/ApJ/756/112doi:10.26093/cds/vizier.17560112CDSLu R.-J.Wei J.-J.Liang E.-W.Zhang B.-B.Lu H.-J.Lu L.-Z.,Lei W.-H.Zhang B.2018-01-05T08:55:53Z2014-05-05T15:22:43ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyWe present a time-resolved spectral analysis of 51 long and 11 short bright gamma-ray bursts (GRBs) observed with the Fermi/Gamma-Ray Burst Monitor, paying special attention to E_p_ evolution within each burst. Among eight single-pulse long GRBs, five show an evolution from hard to soft, while three show intensity tracking. The multi-pulse long GRBs have more complicated patterns. Statistically, the hard-to-soft evolution pulses tend to be more asymmetric than the intensity-tracking ones, with a steeper rising wing than the falling wing. Short GRBs have E_p_ tracking intensity exclusively with the 16ms time-resolution analysis. We performed a simulation analysis and suggest that for at least some bursts, the late intensity-tracking pulses could be a consequence of overlapping hard-to-soft pulses. However, the fact that the intensity-tracking pattern exists in the first pulse of the multi-pulse long GRBs and some single-pulse GRBs, suggests that intensity tracking is an independent component, which may operate in some late pulses as well. For the GRBs with measured redshifts, we present a time-resolved E_p_-L_{gamma},iso_ correlation analysis and show that the scatter of the correlation is comparable to that of the global Amati/Yonetoku relation. We discuss the predictions of various radiation models regarding E_p_ evolution, as well as the possibility of a precessing jet in GRBs. The data pose a great challenge to each of these models, and hold the key to unveiling the physics behind GRB prompt emission.2012ApJ...756..112Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)J/A+A/557/A100 : Fermi and Swift GRBs E_peak_-E_iso_ relation (Heussaff+, 2013)J/ApJS/208/21 : The BATSE 5B GRB spectral catalog (Goldstein+, 2013)J/ApJS/207/39 : IPN supplement to the Fermi GBM (Hurley+, 2013)J/ApJS/199/18 : The Fermi GBM catalog (Paciesas+, 2012)J/ApJ/754/121 : GRBs from Fermi/GBM and LAT (The Fermi Team, 2012)J/ApJ/740/104 : BATSE GRB pulse catalog - preliminary data (Hakkila+, 2011)J/A+A/530/A21 : Spectral properties of 438 GRBs (Nava+, 2011)J/A+A/525/A53 : GBM parameters for detected FERMI bursts (Guetta+, 2011)J/ApJ/720/1146 : Spectral analysis of GRBs (Lu+, 2010)J/ApJS/166/298 : Spectral cat. of bright BATSE gamma-ray bursts (Kaneko+, 2006)J/ApJ/609/935 : Gamma-ray burst formation rate (Yonetoku+, 2004)J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)http://fermi.gsfc.nasa.gov/ssc/data/access : Fermi SSC home pageftp://legacy.gsfc.nasa.gov/fermi/data : Fermi data accesshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/112https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/756/112/grb (List of GRBs in the sample (table added by CDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/112/grb?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/112/grb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/112/grb?GETtext/xml+votable180.050000true234.0-4.70.0055555555555555566/210 390 2563 3111 3586 3806 4228 4236 5139 5625 7332 7789 7890 7982 9060 9276 9431 9675 12164 12826 13191 13895 14259 15201 16282 16661 17411 20077 20800 21284 22181 22838 23423 23528 24378 26735 27961 27962 28692 28930 31270 32419 32646 34933 35448 35633 36444 36460 36858 37628 38362 39594 40461 40778 40839 42892 43558 44136 44277 45373 45401 45464 45483 46218 46813 47031https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/756/112?format=asciiGamma-raydefaultJ/ApJ/756/112/grbList of GRBs in the sample (table added by CDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB identifier (YYMMDDA)meta.id;meta.maincharprimaryn_GRB[LS ] L=long GRB (see figure 2); S=short GRB (see figure 3)meta.notecharGBMDisplay the Fermi GBM data (Cat. J/ApJS/199/18)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.refchar_RAPositions (when known) from SIMBAD database (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions (when known) from SIMBAD database (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/756/112/table1Time-resolved spectral fits with the band function for the GRBs in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB identifier (YYMMDDA)meta.id;meta.maincharprimaryNz[1/44] Slice numbermeta.idintTbeg[-13/185] Start timestime.epochfloatTend[-4./189] End timestime.epochfloatEp[5.8/6889] Peak energy of the spectrumkeVem.energyfloate_Ep[0/1003] Uncertainty in EpkeVstat.errorfloatalpha[-1.8/2.2] Low energy photon spectral indexspect.indexfloate_alpha[0/1.5] Uncertainty in alphastat.error;pos.eq.rafloatbeta[-13.2/-1.2] High energy photon spectral indexspect.indexfloate_beta[0/1.5] Uncertainty in betastat.errorfloatFlu[0.02/272] Fluence in 10-1000keV band; in 10^-6^erg/cm^2^ unitnJ.m**-2phot.fluence;em.gamma.hardfloate_Flu[0.01/2] Uncertainty in FlunJ.m**-2stat.errorfloatchi2Model reduced {chi}^2^stat.fit.chi2float