J/ApJ/781/37ivo://CDS.VizieR/J/ApJ/781/37doi:10.26093/cds/vizier.17810037CDSPerley D.A.Cenko S.B.Corsi A.Tanvir N.R.Levan A.J.Kann D.A.,Sonbas E.Wiersema K.Zheng W.Zhao X.-H.Bai J.-M.Bremer M.,Castro-Tirado A.J.Chang L.Clubb K.I.Frail D.Fruchter A.Gogus E.,Greiner J.Guver T.Horesh A.Filippenko A.V.Klose S.Mao J.,Morgan A.N.Pozanenko A.S.Schmidl S.Stecklum B.Tanga M.,Volnova A.A.Volvach A.E.Wang J.-G.Winters J.-M.Xin Y.-X.2017-06-13T11:08:45Z2015-12-11T09:28:18ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyphotometryWe present multiwavelength observations of the afterglow of GRB130427A, the brightest (in total fluence) Gamma-Ray Burst (GRB) of the past 29yr. Optical spectroscopy from Gemini-North reveals the redshift of the GRB to be z=0.340, indicating that its unprecedented brightness is primarily the result of its relatively close proximity to Earth; the intrinsic luminosities of both the GRB and its afterglow are not extreme in comparison to other bright GRBs. We present a large suite of multiwavelength observations spanning from 300s to 130days after the burst and demonstrate that the afterglow shows relatively simple, smooth evolution at all frequencies, with no significant late-time flaring or rebrightening activity. The entire data set from 1GHz to 10GeV can be modeled as synchrotron emission from a combination of reverse and forward shocks in good agreement with the standard afterglow model, providing strong support to the applicability of the underlying theory and clarifying the nature of the GeV emission observed to last for minutes to hours following other very bright GRBs. A tenuous, wind-stratified circumburst density profile is required by the observations, suggesting a massive-star progenitor with a low mass-loss rate, perhaps due to low metallicity. GRBs similar in nature to GRB 130427A, inhabiting low-density media and exhibiting strong reverse shocks, are probably not uncommon but may have been difficult to recognize in the past owing to their relatively faint late-time radio emission; more such events should be found in abundance by the new generation of sensitive radio and millimeter instruments.2014ApJ...781...37Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/781/37CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/778/128 : GRB-host galaxies photometry (Perley+, 2013)J/ApJ/746/156 : Radio afterglow observations of GRBs (Chandra+, 2012)J/ApJ/743/154 : GRB110205A+110213A multi-band photometry (Cucchiara+, 2011)J/AJ/141/163 : Ultimate light curve of SN 1998bw/GRB 980425J/ApJ/720/1513 : The afterglows of Swift-era GRBs. I. (Kann+, 2010)J/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/693/1484 : Early optical afterglow catalog (Cenko+, 2009)J/ApJ/691/723 : BVIJHKs observations of GRB 080319B (Bloom+, 2009)J/ApJ/672/449 : GRB 061126 light curves (Perley+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/781/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/781/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/781/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/781/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/781/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/781/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticaldefaultJ/ApJ/781/37/table2Radio observations of GRB 130427ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope identifier (1)meta.id;instr.telcharf_Tel[c] From Laskar et al. (2013ApJ...776..119L)meta.codecharTmid[0.3/129] Integration mid-time (G1)dtime.expodoubleBandBandinstr.bandpasscharFreq[1/93] Central frequencyGHzem.freqfloatFlux[86/6100] Flux densityuJyphot.flux.densityinte_Flux[7/2023] Error in FluxuJystat.error;phot.fluxintJ/ApJ/781/37/table1Photometry of GRB 130427ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope identifier (1)meta.id;instr.telcharTmid[0/41] Exposure mid-time (G1)dtime.expodoubleFltFilter usedinstr.setup;instr.filtercharExp[5/10815]? Exposure timestime.duration;obs.exposurefloatnullablemag[7/22] Observed magnitude in Filter (2)magphot.magfloate_mag[0/0.6] Uncertainty in magmagstat.error;phot.magfloatFlux[-1/4.2e+06] Observed flux density in Filter (3)uJyphot.flux.densitydoublee_Flux[0.3/1.6e+06] Uncertainty in FluxuJystat.error;phot.fluxdoubleOut[e] Indicates an outlier observation (e=excluded from analysis)meta.codecharRefGamma-Ray Burst (GRB) Coordinates Network (GCN) circular reference (4)meta.ref;pos.framecharJ/ApJ/781/37/table4Coeval spectral energy distributions (SEDs)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[0/130] Effective timedtime.epochfloatFreq[1.3e+09/3.5e+24] FrequencyHzem.freqdoubleFlux[0/53800] Flux density at FrequJyphot.flux.densitydoublee_Flux[0/5459] Uncertainty in FluxuJystat.error;phot.fluxdouble