J/A+A/707/A392ivo://CDS.VizieR/J/A+A/707/A392CDSZhang X.Yi S.-X.Lei W.-H.Liu T.Yang Y.-P.Qin Y.Qu Y.-K.,Tang Q.-W.Wang F.-Y.2026-04-02T06:28:33Z2026-03-23T14:25:41ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsredshiftedHyperaccreting stellar-mass black hole systems are leading candidates for the central engines of gamma-ray bursts (GRBs). Their jets are thought to be powered by either the Blandford-Znajek (BZ) process or neutrino-dominated accretion flows (NDAFs), but discriminating between these mechanisms remains challenging. To address this, we proposed using the luminosity decay slope (d) of GRB light curves to distinguish between the BZ and NDAF mechanisms, thereby linking the light-curve morphology to the central engine physics. By analysing 85 single-peaked GRBs with fast-rise, exponential-decay (FRED) profiles observed by Swift/BAT using 64 ms background-subtracted light curves, we fitted the decay slope (d) with the empirical Kocevski-Ryde-Liang (KRL) function and compared the results with theoretical predictions for the BZ (d~1.67) and the NDAF (d~3.7-7.8) mechanisms. We find that the decay slope (d) can differentiate central engine mechanisms, with 15 GRBs consistent with the BZ mechanism and 22 supporting the NDAF mechanism. However, most events exhibit slopes within the range 2<d<4, suggesting a hybrid of mechanisms, with NDAF being dominant.2026A&A...707A.392Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A392CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A392https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A392http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A392https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/707/A392https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/707/A392http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/707/A392GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/707/A392/table1 (Fitting parameters of 2004-2025 FRED-individual pulses in Swift)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A392/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A392/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A392/table1?GETtext/xml+votable180.050000true214.3518333-50.53336110.0055555555555555566/524 1102 1266 2948 3071 3098 3417 5625 5840 5941 6758 6904 7227 7606 7614 7750 9589 10602 11220 11748 14948 15144 15972 16057 17411 18097 18435 18843 19389 19544 19890 20030 20372 20460 20679 22793 23138 24097 24214 24495 25733 26910 27566 28467 28729 29212 30088 30471 30557 30931 30956 31903 32771 33525 34465 35633 35970 36308 37231 37383 39418 39682 40167 41309 42133 42663 42952 43045 43280 45836 45852 45893 47188 47744 48447 48481https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/707/A392?format=asciiGamma-raydefaultJ/A+A/707/A392/table1Fitting parameters of 2004-2025 FRED-individual pulses in SwiftrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintrchi2Reduced chi^2^ valuestat.fit.chi2floatBZ[V-] BZ fitted modelmeta.codecharNDAF[V-] NDAF fitted modelmeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharl_T90Limit flag on T90meta.code.errorcharT90Durationstime.durationfloatzCosmological redshiftsrc.redshiftfloatModelModel (PL or CPL)meta.notecharalphaSpectral indexmeta.crypticfloatEpeak? Peak energykeVem.energyfloatnullableFluenceFluence (in 10^-7^erg/cm^2^)1e+14W.cm**-2phot.fluence;em.gamma.hardfloatE_FluenceFluence upper error (in 10^-7^erg/cm^2^)1e+14W.cm**-2stat.error;stat.maxfloate_FluenceFluence lower error (in 10^-7^erg/cm^2^)1e+14W.cm**-2stat.error;phot.fluencefloatEgisoIsotropic gamma-ray energy (in 10^52^erg)1e+45Wem.energyfloatE_EgisoIsotropic gamma-ray energy upper error (in 10^52^erg)1e+45Wstat.error;stat.maxfloate_EgisoIsotropic gamma-ray energy lower error (in 10^52^erg)1e+45Wstat.errorfloatT0T0 (KRL function fitting)meta.notefloatTstartTstart (KRL function fitting)meta.notefloatTendTend (KRL function fitting)meta.notefloatTpPeak time (KRL function fitting)time.epochfloatE_TpPeak time upper error (KRL function fitting)stat.error;stat.maxfloate_TpPeak time lower error (KRL function fitting)stat.errorfloatLpPeak luninosity (in 10^50^erg/s)1e+43Jphys.luminosity;em.gammafloatE_LpPeak luninosity upper error (in 10^50^erg/s)1e+43Jstat.error;stat.maxfloate_LpPeak luninosity lower error (in 10^50^erg/s)1e+43Jstat.errorfloatrPower-law index for the ride phasemeta.crypticfloatE_rPower-law index for the ride phase upper errorstat.error;stat.maxfloate_rPower-law index for the ride phase lower errorstat.errorfloatdPower-law index for the decay phasemeta.crypticfloatE_dPower-law index for the decay phase upper errorstat.error;stat.maxfloate_dPower-law index for the decay phase lower errorstat.errorfloatchi2chi^2^ valuestat.fit.chi2;stat.valuefloatdofDegree of freedomstat.fit.dofint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableGRBGRB namemeta.id;meta.maincharn_GRB[d dd] Note on GRB (1)meta.notechar