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Title:
Swift Panchromatic Observations of the Bright Gamma-Ray Burst GRB 050525a
Authors:
Blustin, A. J.; Band, D.; Barthelmy, S.; Boyd, P.; Capalbi, M.; Holland, S. T.; Marshall, F. E.; Mason, K. O.; Perri, M.; Poole, T.; Roming, P.; Rosen, S.; Schady, P.; Still, M.; Zhang, B.; Angelini, L.; Barbier, L.; Beardmore, A.; Breeveld, A.; Burrows, D. N.; Cummings, J. R.; Canizzo, J.; Campana, S.; Chester, M. M.; Chincarini, G.; Cominsky, L. R.; Cucchiara, A.; de Pasquale, M.; Fenimore, E. E.; Gehrels, N.; Giommi, P.; Goad, M.; Gronwall, C.; Grupe, D.; Hill, J. E.; Hinshaw, D.; Hunsberger, S.; Hurley, K. C.; Ivanushkina, M.; Kennea, J. A.; Krimm, H. A.; Kumar, P.; Landsman, W.; La Parola, V.; Markwardt, C. B.; McGowan, K.; Mészáros, P.; Mineo, T.; Moretti, A.; Morgan, A.; Nousek, J.; O'Brien, P. T.; Osborne, J. P.; Page, K.; Page, M. J.; Palmer, D. M.; Parsons, A. M.; Rhoads, J.; Romano, P.; Sakamoto, T.; Sato, G.; Tagliaferri, G.; Tueller, J.; Wells, A. A.; White, N. E.
Affiliation:
AA(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AB(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AC(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AD(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AE(ASI Science Data Center, via Galileo Galilei, I-00044 Frascati (Rome), Italy.), AF(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AG(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AH(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AI(ASI Science Data Center, via Galileo Galilei, I-00044 Frascati (Rome), Italy.), AJ(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AK(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AL(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AM(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .; Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AN(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AO(Department of Physics, University of Nevada at Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154.), AP(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AQ(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AR(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), AS(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), AT(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AU(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AV(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AW(INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, Italy.), AX(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), AY(INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, Italy.), AZ(Department of Physics and Astronomy, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94928.), BA(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BB(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), BC(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545.), BD(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BE(ASI Science Data Center, via Galileo Galilei, I-00044 Frascati (Rome), Italy.), BF(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), BG(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BH(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BI(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BJ(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BK(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BL(Space Sciences Laboratory, University of California at Berkeley, 7 Gauss Way, Berkeley, CA 94720.), BM(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BN(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BO(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BP(Department of Astronomy, University of Texas, RLM 15.308, Austin, TX 78712-1083.), BQ(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BR(INAF-Istituto di Astrofisica Spaziale e Cosmica, via Ugo La Malfa 153, I-90146 Palermo, Italy.), BS(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), BT(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), BU(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BV(INAF-Istituto di Astrofisica Spaziale e Cosmica, via Ugo La Malfa 153, I-90146 Palermo, Italy.), BW(INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, Italy.), BX(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BY(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802.), BZ(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), CA(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), CB(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), CC(Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; .), CD(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545.), CE(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), CF(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), CG(INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, Italy.), CH(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), CI(Institute of Space and Astronautical Science, Kanagawa 229-8510, Japan.), CJ(INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate, Italy.), CK(NASA Goddard Space Flight Center, Greenbelt, MD 20771.), CL(Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.), CM(NASA Goddard Space Flight Center, Greenbelt, MD 20771.)
Publication:
The Astrophysical Journal, Volume 637, Issue 2, pp. 901-913. (ApJ Homepage)
Publication Date:
02/2006
Origin:
UCP
ApJ Keywords:
Astrometry, Galaxies: Distances and Redshifts, Gamma Rays: Bursts, Shock Waves, X-rays: individual (GRB 050525a)
DOI:
10.1086/498425
Bibliographic Code:
2006ApJ...637..901B

Abstract

The bright gamma-ray burst GRB 050525a 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 3.2d. We derive an empirical ``time-lag'' redshift from the BAT data of ẑ=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 modeled by a simple power law with index α=-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 25,000 s. The measured temporal decay and spectral indexes in the X-ray and optical/UV regimes compare favorably with the standard fireball model for gamma-ray bursts assuming expansion into a constant-density interstellar medium.
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