J/ApJ/774/114ivo://CDS.VizieR/J/ApJ/774/114doi:10.26093/cds/vizier.17740114CDSJin Z.-P.Covino S.Della Valle M.Ferrero P.Fugazza D.Malesani D.,Melandri A.Pian E.Salvaterra R.Bersier D.Campana S.Cano Z.,Castro-Tirado A.J.D'Avanzo P.Fynbo J.P.U.Gomboc A.Gorosabel J.,Guidorzi C.Haislip J.B.Hjorth J.Kobayashi S.LaCluyze A.P.,Marconi G.Mazzali P.A.Mundell C.G.Piranomonte S.Reichart D.E.,Sanchez-Ramirez R.Smith R.J.Steele I.A.Tagliaferri G.Tanvir N.R.,Valenti S.Vergani S.D.Vestrand T.Walker E.S.Wozniak P.2017-06-26T11:48:57Z2015-03-27T07:03:57ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyinfrared-photometryvisible-astronomybroad-band-photometrysupernovaeWe discuss the results of the analysis of multi-wavelength data for the afterglows of GRB 081007 and GRB 090424, two bursts detected by Swift. One of them, GRB 081007, also shows a spectroscopically confirmed supernova, SN 2008hw, which resembles SN 1998bw in its absorption features, while the maximum magnitude may be fainter, up to 0.7mag, than observed in SN 1998bw. Bright optical flashes have been detected in both events, which allows us to derive solid constraints on the circumburst-matter density profile. This is particularly interesting in the case of GRB 081007, whose afterglow is found to be propagating into a constant-density medium, yielding yet another example of a gamma-ray burst (GRB) clearly associated with a massive-star progenitor which did not sculpt the surroundings with its stellar wind. There is no supernova component detected in the afterglow of GRB 090424, likely due to the brightness of the host galaxy, comparable to the Milky Way. We show that the afterglow data are consistent with the presence of both forward- and reverse-shock emission powered by relativistic outflows expanding into the interstellar medium. The absence of optical peaks due to the forward shock strongly suggests that the reverse-shock regions should be mildly magnetized. The initial Lorentz factor of outflow of GRB 081007 is estimated to be {Gamma}~200, while for GRB 090424 a lower limit of {Gamma}>170 is derived. We also discuss the prompt emission of GRB 081007, which consists of just a single pulse. We argue that neither the external forward-shock model nor the shock-breakout model can account for the prompt emission data and suggest that the single-pulse-like prompt emission may be due to magnetic energy dissipation of a Poynting-flux-dominated outflow or to a dissipative photosphere.2013ApJ...774..114Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/774/114CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/565/A72 : Opt. & X-ray light curves of BAT6 sample (Melandri+, 2014)J/A+A/557/A12 : Optical light curves of {gamma}-ray bursts (Zaninoni+, 2013)J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013)J/ApJS/209/20 : Swift GRB catalog with X-ray data (Grupe+, 2013)J/ApJ/763/15 : Fermi GRB analysis. III. T_90_ distributions (Qin+, 2013)J/PASP/124/297 : GRB spectral lags (Li+, 2012)J/ApJ/756/112 : Fermi/GBM GRB time-resolved spectral analysis (Lu+, 2012)J/ApJ/746/170 : Follow-up resources for high-redshift GRBs (Morgan+, 2012)J/A+A/538/A120 : A unified supernova catalogue (Lennarz+, 2012)J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011)J/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/774/114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/774/114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/774/114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/774/114https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/774/114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/774/114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.762881831355591e-19 3.3785437584409506e-19Gamma-rayOpticalInfrareddefaultJ/ApJ/774/114/table1Properties of GRB 081007 and GRB 090424SNSN detectionmeta.id.assoccharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB identifier (YYMMDD)meta.id;meta.mainintLCLight curvesmeta.ref.urlcharT90T_90_ durationstime.durationinte_T90? T90 uncertaintysstat.errorintnullabler_T90T90 reference (1)meta.ref;pos.frameintz[0.52/0.55] Redshiftsrc.redshiftfloate_z? z uncertaintystat.error;src.redshiftfloatnullableEpkEnergy peakkeVem.energyintE_EpkPositive error on EpkkeVstat.error;stat.maxinte_EpkNegative error on EpkkeVstat.errorintr_EpkEpk reference (1)meta.ref;pos.frameintEisoIsotropic-equivalent energy of the prompt gamma-ray emission (E_{gamma},iso_) in erg1e-07Jphys.energydoubleE_EisoPositive error on Eiso1e-07Jstat.error;stat.maxdoublee_EisoNegative error on Eiso1e-07Jstat.errordoubler_EisoEiso reference (1)meta.ref;pos.frameintl_gamma[~>] Limit flag on gammameta.code.errorchargamma[170/200] Outflow Lorentz factor ({Gamma}, see equation 3)stat.fit.paramintl_RB[~>] Limit flag on RBmeta.code.errorcharRBFraction of the reverse (forward) shock energy given to the magnetic field (see section 3.4)stat.fit.paraml_RgalLimit flag on Rgalmeta.code.error;pos.distance;pos.galactocentriccharRgal[22/25] R-band host galaxy magnitudemagphot.mag;em.opt.Rfloate_Rgal? Rgal uncertaintymagstat.error;pos.distance;pos.galactocentricfloatnullableJ/ApJ/774/114/table3Optical observations of GRB 090424l_magLimit flag on magmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument used in the observationinstr.setup;obscharFiltFilter used in the observation (UVW1, UVM2, UVW2, White, ubv, BVRcIc, g'i'r'z', JHKs)instr.setup;obscharTmidTime of mid-exposure (1)mintime.expodoubleExp[0.01/212] Exposure timemintime.duration;obs.exposurefloatmag[13.8/25] Observed AB magnitude in Filt (2)magphot.magfloate_mag[0.02/1.4]? Error in magmagstat.error;phot.magfloatnullableJ/ApJ/774/114/table2Optical observations of GRB 081007l_magLimit flag on magmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument used in the observationinstr.setup;obscharFiltFilter used in the observation (UVW1, UVM2, UVW2, White, ubv, BVRcIc, g'i'r'z', JHKs)instr.setup;obscharTmidTime of mid-exposure (1)mintime.expodoubleExp[0.01/212] Exposure timemintime.duration;obs.exposurefloatmag[13.8/25] Observed AB magnitude in Filt (2)magphot.magfloate_mag[0.02/1.4]? Error in magmagstat.error;phot.magfloatnullable