J/ApJ/748/134ivo://CDS.VizieR/J/ApJ/748/134doi:10.26093/cds/vizier.17480134CDSGao H.Zhang B.-B.Zhang B.2017-10-03T05:12:54Z2013-11-29T11:17:14ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyGamma-ray bursts (GRBs) have variable light curves. Although most models attribute the observed variability to one physical origin (e.g., central engine activity, clumpy circumburst medium, or relativistic turbulence), some models invoke two physically distinct variability components. We develop a method, namely, the stepwise filter correlation method, to decompose the variability components in a GRB light curve. Based on a low-pass filter technique, we progressively filter the high-frequency signals from the light curve, and then perform a correlation analysis between each adjunct pair of filtered light curves. Our simulations suggest that if a mock light curve contains a "slow" variability component superposed on a rapidly varying time sequence, the correlation coefficient as a function of the filter frequency would display a prominent "dip" feature around the frequency of the slow component. Through simulations, we demonstrate that this method can identify significant clustering structures of a light curve in the frequency domain, and we prove that it can catch superposed signals that are otherwise not easy to retrieve based on other methods (e.g., the power density spectrum analysis method). We apply this method to 266 Burst and Transient Source Experiment bright GRBs. We find that the majority of the bursts have clear evidence of such a superposition effect. We perform a statistical analysis of the identified variability components and discuss the implications for GRB physics.2012ApJ...748..134Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/748/134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)J/ApJ/744/141 : Shapes of GRB light curves (Bhat+, 2012)J/ApJS/166/298 : Bright BATSE gamma-ray bursts spectral cat. (Kaneko+, 2006)J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)http://heasarc.gsfc.nasa.gov/docs/cgro/batse/ : BATSE NASA home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/748/134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/748/134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/748/134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/748/134https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/748/134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/748/134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/748/134/table1 (Characteristic timescales identified in BATSE bright gamma-ray bursts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/134/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/134/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/134/table1?GETtext/xml+votable180.050000true197.99-2.480.0055555555555555566/174 1016 1140 1549 1734 2087 2161 2444 3051 3108 3157 3209 3409 4102 4482 4633 4997 5183 5315 5673 6128 6549 6731 6841 7291 7820 8083 8144 8208 8589 9693 9864 9895 9951 11107 11559 12739 12844 13238 13615 14148 14245 14418 15112 15440 15602 15704 16303 16667 16813 17453 17551 17555 17914 19183 19286 19792 19828 20346 20618 20724 22023 22580 22662 24037 24066 24795 25160 25233 25961 26109 26179 26182 26868 27030 27408 27524 28421 29225 30414 30550 30574 31036 32111 32567 32838 32889 32928 33583 33623 33955 34076 34859 35273 35620 35627 35800 35954 36194 36685 37560 37939 38720 38783 39055 39187 39586 40092 40840 40935 41005 41724 42369 43322 44201 44555 44700 44750 45170 45777 46805 46809 47733 47962 48769https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/748/134?format=asciiGamma-raydefaultJ/ApJ/748/134/table1Characteristic timescales identified in BATSE bright gamma-ray burstsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTrigTrigger number from the 4th BATSE catalog (Cat. IX/20)meta.idintNameGRB or 4B designation (YYMMDDA) (1)meta.idcharT90[6/319] Burst T_90_ duration from BATSE (Cat.IX/20)stime.durationfloatT1[1/226] Characteristic timescale corresponding to the first dip (2)stime.intervalfloats1[0/1] significance of first dip (3)stat.fit.goodnessfloatc1[0.9/1] T1 c parameter (3)stat.fit.goodnessfloatT2[0/89]? Characteristic timescale corresponding to the second dip (2)stime.intervalfloatnullables2[0/1]? significance of second dip (3)stat.fit.goodnessfloatnullablec2[0.9/1]? T2 c parameter (3)stat.fit.goodnessfloatnullableT3[0/28]? Characteristic timescale corresponding to the third dip (2)stime.intervalfloatnullables3[0/1]? significance of third dip (3)stat.fit.goodnessfloatnullablec3[0.9/1]? T3 c parameter (3)stat.fit.goodnessfloatnullableT4[0/9]? Characteristic timescale corresponding to the fourth dip (2)stime.intervalfloatnullables4[0/1]? significance of fourth dip (3)stat.fit.goodnessfloatnullablec4[0.9/1]? T4 c parameter (3)stat.fit.goodnessfloatnullableBATSEDisplay the 4th BATSE catalog (Cat. IX/20) for this sourcemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from 4th BATSE catalog (Cat. IX/20) according to Name or Name+T90 value (right ascension part)degpos.eq.ra;meta.main_DEPositions from 4th BATSE catalog (Cat. IX/20) according to Name or Name+T90 value (declination part)degpos.eq.dec;meta.main