J/A+A/568/A75ivo://CDS.VizieR/J/A+A/568/A75doi:10.26093/cds/vizier.35680075CDSGreiner J.Yu H.-F.Kruhler T.Frederiks D.D.Beloborodov A.,Bhat P.N.Bolmer J.van Eerten H.Aptekar R.L.Elliott J.,Golenetskii S.V.Graham J.F.Hurley K.Kann D.A.Klose S.,Nicuesa Guelbenzu A.Rau A.Schady P.Schmidl S.Sudilovsky V.,Svinkin D.S.Tanga M.Ulanov M.V.Varela K.von Kienlin A.Zhang X.-L.2017-07-12T06:59:24Z2014-08-20T08:27:58ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyinfrared-photometryvisible-astronomybroad-band-photometryPrompt or early optical emission in gamma-ray bursts (GRBs) is notoriously difficult to measure, and observations of the dozen cases show a large variety of properties. Yet, such early emission promises to help us achieve a better understanding of the GRB emission process(es). We performed dedicated observations of the ultra-long duration (T90 about 7000s) Swift GRB 130925A in the optical/near-infrared with the 7-channel Gamma-Ray burst Optical and Near-infrared Detector (GROND) at the 2.2m MPG/ESO telescope. We detect an optical/near-infrared flare with an amplitude of nearly 2mag which is delayed with respect to the keV-MeV prompt emission by about 300-400s. The decay time of this flare is shorter than the duration of the flare (500s) or its delay. While we cannot offer a straightforward explanation, we discuss the implications of the flare properties and suggest ways toward understanding it.2014A&A...568A..75Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/568/A75CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/562/A29 : GRB 100814A GROND and UVOT light curves (Nardini+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/568/A75https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/568/A75http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/568/A75https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/568/A75https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/568/A75http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/568/A75GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticalInfrareddefaultJ/A+A/568/A75/grondCombined table from original tablesTexpHalf of exposure lengthsphys.size;obs.exposurefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[grizJHK] Observed bandinstr.bandpasscharTmidMid-time of exposure after Swift triggerstime.epochdoublemag[16.5/23] Magnitude in Band in AB system, not corrected for foreground or intrinsic extinctionmagphot.magfloate_mag[0.03/0.3] Magnitude error (1{sigma})magstat.error;phot.magfloatFluxFlux in Band, not corrected for foreground or intrinsic extinctionuJyphot.fluxfloate_FluxNegative flux error (1-{sigma})uJystat.error;phot.fluxfloatE_FluxPositive flux error (1-{sigma})uJystat.error;stat.maxfloat