<i>Swift</i>Panchromatic Observations of the Bright Gamma‐Ray Burst GRB 050525a
A. J. BlustinDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKD. L. BandNASA Goddard Space Flight Center, Greenbelt, MD 20771A. P. BeardmoreNASA Goddard Space Flight Center, Greenbelt, MD 20771Patricia T. BoydNASA Goddard Space Flight Center, Greenbelt, MD 20771M. CapalbiK. L. PageNASA Goddard Space Flight Center, Greenbelt, MD 20771F. E. MarshallNASA Goddard Space Flight Center, Greenbelt, MD 20771K. O. MasonDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKM. PerriT. PooleDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKP. W. A. RomingDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802S. R. RosenDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKP. SchadyDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802Martin StillNASA Goddard Space Flight Center, Greenbelt, MD 20771Bing ZhangDepartment of Physics, University of Nevada at Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154L. AngeliniNASA Goddard Space Flight Center, Greenbelt, MD 20771W. H. BaumgartnerNASA Goddard Space Flight Center, Greenbelt, MD 20771A. A. BreeveldDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKD. N. BurrowsDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802J. R. CummingsNASA Goddard Space Flight Center, Greenbelt, MD 20771J. CanizzoNASA Goddard Space Flight Center, Greenbelt, MD 20771S. CampanaINAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, ItalyM. ChesterDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802G. ChincariniINAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, ItalyL. R. CominskyDepartment of Physics and Astronomy, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94928Antonino CucchiaraDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802M. de PasqualeDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKE. E. FenimoreLos Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545N. GehrelsNASA Goddard Space Flight Center, Greenbelt, MD 20771P. GiommiM. R. GoadDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKC. GronwallDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802D. GrupeDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802J. E. HillNASA Goddard Space Flight Center, Greenbelt, MD 20771D. A. HinshawNASA Goddard Space Flight Center, Greenbelt, MD 20771S. HunsbergerDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802K. HurleySpace Sciences Laboratory, University of California at Berkeley, 7 Gauss Way, Berkeley, CA 94720M. IvanushkinaDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802J. A. KenneaDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802H. KrimmNASA Goddard Space Flight Center, Greenbelt, MD 20771Pawan KumarDepartment of Astronomy, University of Texas, RLM 15.308, Austin, TX 78712-1083V. La ParolaNASA Goddard Space Flight Center, Greenbelt, MD 20771C. B. MarkwardtNASA Goddard Space Flight Center, Greenbelt, MD 20771K. McGowanDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKP. MészárosDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802T. MineoINAF-Istituto di Astrofisica Spaziale e Cosmica, via Ugo La Malfa 153, I-90146 Palermo, ItalyA. MorettiINAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, ItalyA. MorganDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802J. A. NousekDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802P. T. O’BrienDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKJ. P. OsborneDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKM. J. PageDepartment of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKD. M. PalmerLos Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545A. ParsonsNASA Goddard Space Flight Center, Greenbelt, MD 20771James E. RhoadsSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218P. RomanoINAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, ItalyT. SakamotoNASA Goddard Space Flight Center, Greenbelt, MD 20771G. SatoInstitute of Space and Astronautical Science, Kanagawa 229-8510, JapanG. TagliaferriINAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, ItalyJ. TuellerNASA Goddard Space Flight Center, Greenbelt, MD 20771A. A. WellsDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKN. E. WhiteNASA Goddard Space Flight Center, Greenbelt, MD 20771
2006en
ABI
Abstract
The bright gamma-ray burst GRB050525a has been detected with the Swift observatory, providing unique multiwavelength coverage from the very earliest phases of the burst. The X-ray and optical/UV afterglow decay light curves both exhibit a steeper slope ~0.15 days after the burst, indicative of a jet break. This jet break time combined with the total gamma-ray energy of the burst constrains the opening angle of the jet to be 3.2 degrees. We derive an empirical `time-lag' redshift from the BAT data of z_hat = 0.69 +/- 0.02, in good agreement with the spectroscopic redshift of 0.61. Prior to the jet break, the X-ray data can be modelled by a simple power law with index alpha = -1.2. However after 300 s the X-ray flux brightens by about 30% compared to the power-law fit. The optical/UV data have a more complex decay, with evidence of a rapidly falling reverse shock component that dominates in the first minute or so, giving way to a flatter forward shock component at later times. The multiwavelength X-ray/UV/Optical spectrum of the afterglow shows evidence for migration of the electron cooling frequency through the optical range within 25000 s. The measured temporal decay and spectral indices in the X-ray and optical/UV regimes compare favourably with the standard fireball model for Gamma-ray bursts assuming expansion into a constant density interstellar medium.
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Cited by 20 references