J/ApJ/672/449ivo://CDS.VizieR/J/ApJ/672/449doi:10.26093/cds/vizier.16720449CDSPerley D.A.Bloom J.S.Butler N.R.Pollack L.K.Holtzman J.,Blake C.H.Kocevski D.Vestrand W.T.Li W.Foley R.J.Bellm E.,Chen H.-W.Prochaska J.X.Starr D.Filippenko A.V.Falco E.E.,Szentgyorgyi A.H.Wren J.Wozniak P.R.White R.Pergande J.2017-07-11T13:08:48Z2010-06-18T09:59:34ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyphotometryWe report on observations of a gamma-ray burst (GRB 061126) with an extremely bright (R~12mag at peak) early-time optical afterglow. The optical afterglow is already fading as a power law 22s after the trigger, with no detectable prompt contribution in our first exposure, which was coincident with a large prompt-emission gamma-ray pulse. The optical-infrared photometric SED is an excellent fit to a power law, but it exhibits a moderate red-to-blue evolution in the spectral index at about 500s after the burst. This color change is contemporaneous with a switch from a relatively fast decay to slower decay.2008ApJ...672..449Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/672/449CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/672/449https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/672/449http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/672/449https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/672/449https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/672/449http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/672/449GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticaldefaultJ/ApJ/672/449/table1XRT light curve of GRBrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTstartObservation start time (1)stime.start;obsdoubleTendObservation end time (1)stime.end;obsdoubleFluxSwift/XRT flux (2)uJyphot.flux;em.X-raydoublee_FluxUncertainty in FluxuJystat.error;phot.fluxdoubleJ/ApJ/672/449/obsObservations in UV, optical and near-IRrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTOriginal table numbermeta.id;meta.datasetcharTmidMid-time of exposure (1)stime.duration;obs.exposurefloatFiltFilter used (2)instr.setup;instr.filtercharExpTimeExposure timestime.duration;obs.exposurefloatl_mag[>= ] Limit flag on magmeta.code.errorcharmagObserved magnitude in Filt (3)magphot.magfloate_mag? Uncertainty in magmagstat.error;phot.magfloatnullablef_mag[c] Flag on mag (4)meta.codecharl_Flux[<= ] Limit flag on Fluxmeta.code.error;phot.fluxcharFluxObserved flux (3)uJyphot.flux.density;em.optfloate_Flux? Uncertainty in FluxuJystat.error;phot.fluxfloatnullable