J/MNRAS/454/L31ivo://CDS.VizieR/J/MNRAS/454/L31doi:10.26093/cds/vizier.74549031CDSAhlgren B.Larsson J.Nymark T.Ryde F.Pe'er A.2024-08-15T20:16:32Z2018-01-15T08:38:29ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyastronomical-modelsThe origin of the prompt emission in gamma-ray bursts (GRBs) is still an unsolved problem and several different mechanisms have been suggested. Here, we fit Fermi GRB data with a photospheric emission model which includes dissipation of the jet kinetic energy below the photosphere. The resulting spectra are dominated by Comptonization and contain no significant contribution from synchrotron radiation. In order to fit to the data, we span a physically motivated part of the model's parameter space and create DREAM (Dissipation with Radiative Emission as A table Model), a table model for XSPEC. We show that this model can describe different kinds of GRB spectra, including GRB 090618, representing a typical Band function spectrum, and GRB 100724B, illustrating a double peaked spectrum, previously fitted with a Band+blackbody model, suggesting they originate from a similar scenario. We suggest that the main difference between these two types of bursts is the optical depth at the dissipation site.2015MNRAS.454L..31Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/L31CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/754/121 : GRBs from Fermi/GBM and LAT (The Fermi Team, 2012)J/ApJ/756/112 : Fermi/GBM GRB time-resolved spectral analysis (Lu+, 2012)J/A+A/573/A81 : Spectral properties of energetic GRBs (Yu+, 2015)J/A+A/588/A135 : Fermi/GBM GRB time-resolved spectral catalog (Yu+, 2016)J/ApJ/818/18 : Jet angles and gamma-ray energetics estimationsJ/ApJS/223/28 : The third Fermi/GBM GRB catalog (6yr) (Bhat+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/L31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/L31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/L31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/L31https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/L31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/L31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-raydefaultJ/MNRAS/454/L31/table1Best-fitting parameters for GRB 090618 fitted with the DREAM modelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintb_TimeTime interval, lower valuestime.interval;stat.minfloatB_TimeTime interval, upper valuestime.interval;stat.maxfloatpgstat[233/670] pgstat valuestatintdof[240/383] Degrees of freedomstat.fit.dofinttauOptical depth {tau}phys.absorption.opticalDepthfloatE_tauUpper limit uncertainty in taustat.error;stat.maxfloate_tauLower limit uncertainty in taustat.errorfloatGammaBulk flow Lorentz factor {Gamma}stat.fit.paramfloatE_GammaUpper limit uncertainty in Gammastat.error;stat.maxfloate_GammaLower limit uncertainty in Gammastat.errorfloatL0.52Luminosity (L_0,52_=L_0_10^-52^erg/s) (1)1e-59Wphys.luminosityfloatE_L0.52Upper limit uncertainty in L0.521e-59Wstat.error;stat.maxfloate_L0.52Lower limit uncertainty in L0.521e-59Wstat.errorfloatepsilonDissipated energy {epsilon}_d_ (2)phys.energyfloatE_epsilonUpper limit uncertainty in epsilonstat.error;stat.maxfloate_epsilonLower limit uncertainty in epsilonstat.errorfloatJ/MNRAS/454/L31/table2Best-fitting parameters for GRB 100724B fitted with the DREAM modelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintb_TimeTime interval, lower valuestime.interval;stat.minfloatB_TimeTime interval, upper valuestime.interval;stat.maxfloatpgstat[233/670] pgstat valuestatintdof[240/383] Degrees of freedomstat.fit.dofinttauOptical depth {tau}phys.absorption.opticalDepthfloatE_tauUpper limit uncertainty in taustat.error;stat.maxfloate_tauLower limit uncertainty in taustat.errorfloatGammaBulk flow Lorentz factor {Gamma}stat.fit.paramfloatE_GammaUpper limit uncertainty in Gammastat.error;stat.maxfloate_GammaLower limit uncertainty in Gammastat.errorfloatL0.52Luminosity (L_0,52_=L_0_10^-52^erg/s) (1)1e-59Wphys.luminosityfloatE_L0.52Upper limit uncertainty in L0.521e-59Wstat.error;stat.maxfloate_L0.52Lower limit uncertainty in L0.521e-59Wstat.errorfloatepsilonDissipated energy {epsilon}_d_ (2)phys.energyfloatE_epsilonUpper limit uncertainty in epsilonstat.error;stat.maxfloate_epsilonLower limit uncertainty in epsilonstat.errorfloat