J/ApJ/828/36ivo://CDS.VizieR/J/ApJ/828/36doi:10.26093/cds/vizier.18280036CDSDel Vecchio R.Dainotti M.G.Ostrowski M.2017-10-13T15:40:48Z2017-01-10T06:54:38ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyIn this work, we study the distribution of temporal power-law decay indices, {alpha}, in the gamma-ray burst (GRB) afterglow phase, fitted for 176 GRBs (139 long GRBs, 12 short GRBs with extended emission, and 25 X-ray flashes) with known redshifts. These indices are compared with the temporal decay index, {alpha}_W_, derived with the light-curve fitting using the Willingale+ (2007ApJ...662.1093W) model. This model fitting yields similar distributions of {alpha}_W_ to the fitted {alpha}, but for individual bursts a difference can be significant. Analysis of ({alpha}, L_a_) distribution, where L_a_ is the characteristic luminosity at the end of the plateau, reveals only a weak correlation of these quantities. However, we discovered a significant regular trend when studying GRB {alpha} values along the Dainotti+ (2013ApJ...774..157D) correlation between L_a_ and the end time of the plateau emission in the rest frame, T_a_^*^, hereafter LT correlation. We note a systematic variation of the {alpha} parameter distribution with luminosity for any selected T_a_^*^. We analyze this systematics with respect to the fitted LT correlation line, expecting that the presented trend may allow us to constrain the GRB physical models. We also attempted to use the derived correlation of {alpha}(T_a_) versus L_a_(T_a_) to diminish the luminosity scatter related to the variations of {alpha} along the LT distribution, a step forward in the effort of standardizing GRBs. A proposed toy model accounting for this systematics applied to the analyzed GRB distribution results in a slight increase of the LT correlation coefficient.2016ApJ...828...36Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/828/36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/43 : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)J/A+A/589/A98 : Swift GRBs power density spectra (Guidorzi+, 2016)J/ApJS/224/20 : 10yr of Swift/XRT obs. of GRBs (Yi+, 2016)J/ApJ/800/16 : Swift-XRT long GRB durations (Boer+, 2015)J/ApJS/209/20 : Swift GRB catalog with X-ray data (Grupe+, 2013)J/ApJ/774/157 : Swift GRBs with X-ray afterglows and z<9.5 (Dainotti+, 2013)J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013)J/MNRAS/418/2202 : Analysis of {gamma}-ray bursts (Dainotti+, 2011)J/ApJ/731/103 : Redshift catalog for Swift long GRBs (Xiao+, 2011)J/ApJ/720/1513 : The afterglows of Swift-era GRBs. I. (Kann+, 2010)J/ApJ/701/824 : Afterglows of short & long-duration GRBs (Nysewander+, 2009)J/ApJ/690/163 : The first Swift UV-Opt GRB afterglow catalog (Roming+, 2009)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)http://www.swift.ac.uk/burst_analyser/ : All GRBs observed by Swift LC fluxeshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/828/36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/828/36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/828/36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/828/36https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/828/36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/828/36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/828/36/table1 (GRB afterglow decay index fits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/828/36/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/828/36/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/828/36/table1?GETtext/xml+votable180.050000true306.475417-42.6006080.0055555555555555566/207 314 393 500 503 646 699 923 1001 2948 3111 3536 3586 4312 4323 4341 4371 4449 4450 4955 5051 5625 5726 5941 6261 6523 7182 7227 7518 7589 8074 8459 8798 8932 9100 9321 9370 9643 10094 10135 10335 10407 10447 10519 10602 10762 10852 11058 11220 11657 11673 11713 11822 11905 12134 12597 13312 13694 13701 13924 15530 16282 16661 16991 17316 17411 17721 17814 18494 18681 18728 18777 18978 19164 19168 19731 19865 19890 19911 20191 20372 21284 21766 21962 22559 22619 23138 24007 25761 25901 25946 26671 27085 27289 27566 27906 27933 27962 27983 28032 28063 28234 28930 29731 29816 30088 31281 31385 31494 31521 31583 31934 32110 32239 32713 33004 33146 33265 33278 33543 33679 33735 34364 34440 34465 34699 34949 35330 35393 35569 35633 36066 36074 36297 36460 36528 37391 38280 38926 39076 39993 40273 40433 40778 41064 42545 42901 43193 44022 44212 44436 44857 45008 45180 45205 45361 45409 45510 45828 45938 46022 46218 46510 46989 47031 47162 47245 47436 47459 47991 48458 49004https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/828/36?format=asciiGamma-raydefaultJ/ApJ/828/36/table1GRB afterglow decay index fitsGRBGRB identifier (YYMMDDA)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl_alphaLimit flag on alphameta.code.error;pos.eq.racharalpha[0.49/3.41] Fitted decay indexspect.indexfloate_alpha[0.01/0.4] Uncertainty in alphastat.error;pos.eq.rafloatlogT1[1.9/6] Log of starting time of fitlog(s)time.epochfloatlogT2[3/7.1] Log of ending time of fitlog(s)time.epochfloatTypeGRB type (L=long; S=short and XRF=X-ray flashes)src.classcharSCatDisplay Swift data from Dainotti+, 2013, J/ApJ/774/157 and 2011, J/MNRAS/418/2202; Grupe+, 2013, J/ApJS/209/20 and Margutti+, 2013, J/MNRAS/428/729 for this GRBmeta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad 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