J/ApJ/904/166ivo://CDS.VizieR/J/ApJ/904/166doi:10.26093/cds/vizier.19040166CDSCunningham V.Cenko S.B.Ryan G.Vogel S.N.Corsi A.Cucchiara A.,Fruchter A.S.Horesh A.Kangas T.Kocevski D.Perley D.A.Racusin J.2022-06-13T13:25:01Z2022-04-04T07:24:39ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsvisible-astronomyradio-sourcesx-ray-sourcesWe present multiwavelength modeling of the afterglow from the long {gamma}-ray burst (GRB)160625B using Markov Chain Monte Carlo techniques of the afterglowpy Python package. GRB160625B is an extremely bright burst with a rich set of observations spanning from radio to {gamma}-ray frequencies. These observations range from ~0.1days to >1000days, thus making this event extremely well suited to such modeling. In this work we compare top-hat and Gaussian jet structure types in order to find best-fit values for the GRB jet collimation angle, viewing angle, and other physical parameters. We find that a Gaussian-shaped jet is preferred (2.7{sigma}-5.3{sigma}) over the traditional top-hat model. Our estimate for the opening angle of the burst ranges from 1.26 to 3.90, depending on jet-shape model. We also discuss the implications that assumptions on jet shape, viewing angle, and particularly the participation a fraction of electrons have on the final estimation of GRB intrinsic energy release and the resulting energy budget of the relativistic outflow. Most notably, allowing the participation fraction to vary results in an estimated total relativistic energy of ~1053erg. This is two orders of magnitude higher than when the total fraction is assumed to be unity; thus, this parameter has strong relevance for placing constraints on long GRB central engines, details of the circumburst media, and host environment.2020ApJ...904..166Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/904/166CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/781/37 : Multi-band photometry of GRB 130427A (Perley+, 2014)J/ApJ/814/1 : GRB 120326A, 100418A & 100901A multi-wave obs. (Laskar+, 2015)J/ApJ/818/18 : Jet angles & gamma-ray energetic estimations (Goldstein+, 2016)J/ApJ/833/88 : GRB 160509A VLA monitoring campain results (Laskar+, 2016)J/ApJ/829/7 : 3rd Swift/BAT GRB catalog (past ~11yrs) (BAT3) (Lien+, 2016)J/ApJ/859/134 : VLA study of high-redshift GRBs. II. GRB140304A (Laskar+, 2018)J/ApJ/884/121 : Radio to UV observations of GRB 181201A (Laskar+, 2019)J/ApJ/893/46 : The fourth Fermi-GBM GRB catalog: 10 years (von Kienlin+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/904/166https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/904/166http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/904/166https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/904/166https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/904/166http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/904/166GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayX-rayOpticalRadiodefaultJ/ApJ/904/166/table1X-ray datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[0.11/145] Time since GBM trigger in days (1)dtime.intervalfloatEnergy[5] Energy of observationskeVphys.energy;obsintFlux[0.13/5934] Flux densitynJyphot.flux;em.X-raydoublee_Flux[0.03/1268] Error in FluxDensitynJystat.error;phot.fluxdoubleInstInstrument name; Chandra or Swiftmeta.id;instrcharJ/ApJ/904/166/table2Optical datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[0.11/141] Time since GBM trigger in days (1)dtime.intervalfloatFiltBandpass filterinstr.bandpass;instr.filtercharABmag[0/26.6] Apparent AB magnitudephot.magfloate_ABmag[0.01/25] Error in ABmagstat.errorfloatFreq[1.83/8.66] Frequency of observations1e+14Hzem.freq;obsfloatFlux[0/598] Flux density; corrected for extinctionuJyphot.flux.density;em.optfloate_Flux[0.006/46] Error in FluxDensity (2)uJystat.error;phot.fluxfloatSigni[0/1] Significance of upper limit detections (2)stat.fit.goodness;stat.maxintInstInstrument namemeta.id;instrcharJ/ApJ/904/166/table3Radio datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[1.35/1319] Time since GBM trigger in days (1)dtime.intervaldoubleFreq[1.45/39] Frequency of observations in GHzGHzem.freqfloatFlux[0/1310] Flux densityuJyphot.flux.density;em.radiointe_Flux[2.46/270] Error in FluxDensity (2)uJystat.error;phot.fluxfloatSigni[0/1] Significance of upper limit detections (2)stat.fit.goodness;stat.maxintInstInstrument namemeta.id;instrcharRefReference to original publication source (3)meta.bibchar