Swift panchromatic observations of the bright gamma-ray burst GRB 050525a
A. J. Blustin,Scott Barthelmy,P. T. Boyd,M. Capalbi,Stephen T. Holland,F. E. Marshall,Keith O. Mason,M. Perri,T. S. Poole,P. W. A. Roming,Stuart Rosen,Patricia Schady,Patricia Schady,Martin Still,Bing Zhang,Lorella Angelini,L. M. Barbier,A. P. Beardmore,A. A. Breeveld,David N. Burrows,Jay Cummings,J. Canizzo,Sergio Campana,M. M. Chester,G. Chincarini,L. R. Cominsky,A. Cucchiara,M. de Pasquale,E. E. Fenimore,N. Gehrels,P. Giommi,M. R. Goad,Caryl Gronwall,Dirk Grupe,Joanne E. Hill,D. Hinshaw,S. D. Hunsberger,Kevin Hurley,M. Ivanushkina,J. A. Kennea,Hans A. Krimm,Pawan Kumar,W. B. Landsman,V. La Parola,C. B. Markwardt,Katherine E. McGowan,Peter Mészáros,Teresa Mineo,A. Moretti,Adam N. Morgan,J. A. Nousek,P. T. O'Brien,J. P. Osborne,K. L. Page,M. J. Page,David Palmer,A. M. Parsons,James E. Rhoads,P. Romano,T. Sakamoto,G. Sato,Gianpiero Tagliaferri,Jack Tueller,Alan A. Wells,Nicholas E. White +64 more
- Vol. 637, Iss: 2, pp 901-913
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TLDR
In this paper, the authors derived an empirical timelag redshift from the BAT data of (z) over bar z 0: 69 +/- 0: 02, in good agreement with the spectroscopic redshift of 0.61.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 similar to 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 degrees.2. We derive an empirical `` timelag'' redshift from the BAT data of (z) over bar z 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 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 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.read more
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Journal ArticleDOI
Physical Processes Shaping Gamma-Ray Burst X-Ray Afterglow Light Curves: Theoretical Implications from the Swift X-Ray Telescope Observations
Bing Zhang,Yi-Zhong Fan,Yi-Zhong Fan,J. Dyks,Shiho Kobayashi,Shiho Kobayashi,Peter Mészáros,David N. Burrows,John A. Nousek,Neil Gehrels +9 more
TL;DR: In this article, the authors systematically analyze the possible physical processes that shape the properties of the early X-ray afterglow light curves and use the data to constrain various models.
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Gamma-Ray Bursts in the Swift Era
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Gamma-Ray Bursts in the Swift Era
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The Early X-Ray Emission from GRBs
P. T. O'Brien,Richard Willingale,J. P. Osborne,M. R. Goad,K. L. Page,Simon Vaughan,Evert Rol,A. P. Beardmore,Olivier Godet,Cheryl Hurkett,Alan A. Wells,Bing Zhang,Shiho Kobayashi,David N. Burrows,John A. Nousek,J. A. Kennea,A. Falcone,Dirk Grupe,Neil Gehrels,Scott Barthelmy,J. K. Cannizzo,J. K. Cannizzo,Jay Cummings,Jay Cummings,J. E. Hill,J. E. Hill,Hans A. Krimm,Hans A. Krimm,G. Chincarini,G. Chincarini,Gianpiero Tagliaferri,Sergio Campana,Alberto Moretti,Paolo Giommi,M. Perri,Vanessa Mangano,V. LaParola +36 more
TL;DR: In this article, the early X-ray emission for a sample of 40 gamma-ray bursts (GRBs) obtained using the Swift satellite, for which the narrow-field instruments were pointed at the burst within 10 minutes of the trigger.
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The Hubble Diagram to Redshift >6 from 69 Gamma-Ray Bursts
TL;DR: In this article, the authors constructed a gamma-ray burst (GRB) HD with 69 GRBs over a redshift range from 0.17 to >6, with half the bursts having a redshifts larger than 1.7.
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