Fermi/GBM GRB minimum timescales J/ApJ/811/93 ivo://CDS.VizieR/J/ApJ/811/93 doi:10.26093/cds/vizier.18110093 CDS Golkhou V.Z. Butler N.R. Littlejohns O.M. 2017-10-02T19:28:09Z 2016-01-29T11:37:09Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr gamma-ray-astronomy redshifted We constrain the minimum variability timescales for 938 gamma-ray bursts (GRBs) observed by the Fermi/Gamma-ray Burst Monitor instrument prior to 2012 July 11. The tightest constraints on progenitor radii derived from these timescales are obtained from light curves in the hardest energy channel. In the softer bands --or from measurements of the same GRBs in the hard X-rays from Swift-- we show that variability timescales tend to be a factor of two to three longer. Applying a survival analysis to account for detections and upper limits, we find median minimum timescale in the rest frame for long-duration and short-duration GRBs of 45 and 10ms, respectively. Less than 10% of GRBs show evidence for variability on timescales below 2ms. These shortest timescales require Lorentz factors >~400 and imply typical emission radii R~1x10^14^cm for long-duration GRBs and R~3x10^13^cm for short-duration GRBs. We discuss implications for the GRB fireball model and investigate whether or not GRB minimum timescales evolve with cosmic time. 2015ApJ...811...93G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/811/93 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/ApJS/211/13 : The second Fermi/GBM GRB catalog (4yr) (von Kienlin+, 2014) J/MNRAS/431/3608 : BeppoSAX/GRBM and Fermi/GBM long GRBs (Dichiara+, 2013) J/ApJ/763/15 : Fermi GRB analysis. III. T_90_ distributions (Qin+, 2013) J/ApJ/748/134 : Variability components in BATSE GRB LCs (Gao+, 2012) J/ApJ/756/112 : Fermi/GBM GRB time-resolved spectral analysis (Lu+, 2012) J/A+A/525/A53 : GBM parameters for detected FERMI bursts (Guetta+, 2011) J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010) J/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010) J/MNRAS/268/305 : Variability of optically selected quasars (Hook+ 1994) http://www.mpe.mpg.de/~jcg/grbgen.html : GRBs compilation http://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html : Fermi https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/811/93 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/811/93 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/811/93 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/811/93 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/811/93 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/811/93 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/811/93/table2 (GRB minimum timescales) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/811/93/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/811/93/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/811/93/table2? 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Redshift src.redshift float nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GRB GRB Name meta.id;meta.main char f_dtmin Upper limit flag on dtmin meta.code char dtmin [0.002/32.3] Minimum variability timescale s src.var;stat.min float e_dtmin [0.001/3]? Uncertainty on dtmin s stat.error float nullable dtSN [0.001/20] Shortest measurable timescale s time.scale float e_dtSN [0.001/2] Uncertainty on dtSN s stat.error float T90 [0.04/604.5] Duration time; central 90% of gamma-ray counts s phot.count;em.gamma float e_T90 [0.03/35.4] Uncertainty on T90 s stat.error float T100b [-257.1/58] Estimated event start s time.epoch double T100e [-0.3/608.6] Estimated event stop s time.epoch float sigXtmin [0.05/1.9] Haar-Structure Function; minimum variability timescale time.scale float sigXtSN [0.03/1] Haar-Structure Function; shortest measurable timescale time.scale float r_z [1/2]? Redshift Reference (1) meta.ref;pos.frame int nullable Simbad Simbad column added by the CDS meta.ref.url char _RA Right Ascension (J2000) from SIMBAD (not part of the original data) deg pos.eq.ra;meta.main _DE Declination (J2000) from SIMBAD (not part of the original data) deg pos.eq.dec;meta.main