J/MNRAS/449/L6ivo://CDS.VizieR/J/MNRAS/449/L6doi:10.26093/cds/vizier.74499006CDSCoward D.M.Howell E.J.Wan L.Macpherson D.2024-08-14T20:21:34Z2016-01-06T15:05:20ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyx-ray-sourcesGamma-ray burst (GRB) optical and X-ray afterglow luminosity is expected to correlate with the GRB isotropic equivalent kinetic energy of the outflow in the standard synchrotron model for GRB afterglows. Previous studies, using prompt GRB isotropic equivalent energy (E_iso_) as a proxy for isotropic equivalent kinetic energy, have generally confirmed a correlation between X-ray and optical afterglow luminosities. Assuming that GRB afterglow luminosity does not evolve strongly with redshift, we identify a strong Malmquist bias in GRB optical and X-ray afterglow luminosity data. We show that selection effects dominate the observed E_iso_-L_opt_, X correlations, and have likely been underestimated in other studies. The bias is strongest for a subset of optically faint bursts m>24 at 24h with z>2. After removing this optical selection bias, the E_iso_-L_opt_, X correlation for long GRBs is not statistically significant, but combining both long and short GRB luminosity data the correlation is significant. Using the median of the E_iso_ and L_opt_, X distributions, we apply the synchrotron model assuming the same power-law index for short and long GRBs, but different microphysical parameter distributions. Comparing the ratio of optical and X-ray luminosities, we find tentative evidence that the fraction of post-shock energy in magnetic fields, {epsilon}_B_, could be systematically higher in short GRBs compared to long GRBs.2015MNRAS.449L...6Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/449/L6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010)J/ApJ/720/1513 : The afterglows of Swift-era GRBs. I. (Kann+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/449/L6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/449/L6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/449/L6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/449/L6https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/449/L6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/449/L6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/449/L6/table (LGRB optical data used in the analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/449/L6/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/449/L6/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/449/L6/table?GETtext/xml+votable180.050000true306.4754167-42.60060830.005555555555555556Cone search capability for table J/MNRAS/449/L6/fig3 (Figure 3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/449/L6/fig3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/449/L6/fig3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/449/L6/fig3?GETtext/xml+votable180.050000true306.4754167-42.60060830.0055555555555555566/503 908 923 2044 3536 4397 4450 5051 5376 5726 6261 6445 10447 10519 10762 10852 10912 11657 11673 11905 12597 13312 13924 15054 16991 17453 17814 17980 18777 18978 19164 19731 19865 20030 20191 21688 22129 23138 25901 25946 26503 27906 27962 28234 28497 29019 30557 31281 31385 31494 31700 32239 33617 33679 33735 34440 34788 34949 35330 36074 36528 37007 38926 39076 40433 44021-44022 44857 45008 45180 45938 47031 47162 47459 48007 48054 49004https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/449/L6?format=asciiGamma-rayX-raydefaultJ/MNRAS/449/L6/tableLGRB optical data used in the analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLGRBLGRB namemeta.id;meta.maincharLumOptical luminosity @ 24 hrs (10^46^erg/s) (1)1e+39Wphys.luminosityfloatFluxOptical flux @ 24 hrs in magnitude (1)magphot.flux.density;em.optfloatEisoIsotropic equivalent energy (2)phys.energyfloatzRedshift (3)src.redshiftfloatSimbadSimbad 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/MNRAS/449/L6/fig3Figure 3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB namemeta.id;meta.maincharzRedshiftsrc.redshiftfloatLoptOptical luminosity (10^43^erg/s)1e+34Wphys.luminosity;em.optfloatB_Lopt? Lopt upper interval value1e+34Wphys.luminosity;em.opt;stat.maxfloatnullableb_Lopt? Lopt lower interval value1e+34Wphys.luminosity;em.opt;stat.minfloatnullablee_Lopt? rms uncertainty on Lobt1e+34Wstat.errorfloatnullableEisoIsotropic equivalent energyphys.energydoubleB_EisoEiso upper interval valuephys.energy;stat.maxdoubleb_EisoEiso Lower interval valuephys.energy;stat.mindoubleSimbadSimbad 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.main