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The Astrophysical Journal | 2011

FERMI and swift gamma-ray burst afterglow population studies

Judith Lea Racusin; S. R. Oates; Patricia Schady; D. N. Burrows; M. De Pasquale; Davide Donato; N. Gehrels; S. Koch; J. E. McEnery; Tsvi Piran; P. W. A. Roming; Takanori Sakamoto; C. A. Swenson; Eleonora Troja; V. Vasileiou; Francisco J. Virgili; D. Wanderman; Bing Zhang

The new and extreme population of gamma-ray bursts (GRBs) detected by the Fermi Large Area Telescope (LAT) shows several new features in high-energy gamma rays that are providing interesting and unexpected clues into GRB prompt and afterglow emission mechanisms. Over the last six years, it has been Swift that has provided the robust data set of UV/optical and X-ray afterglow observations that opened many windows into components of GRB emission structure. The relationship between the LAT-detected GRBs and the well-studied, fainter, and less energetic GRBs detected by the Swift Burst Alert Telescope is only beginning to be explored by multi-wavelength studies. We explore the large sample of GRBs detected by BAT only, BAT and the Fermi Gamma-ray Burst Monitor (GBM), and GBM and LAT, focusing on these samples separately in order to search for statistically significant differences between the populations, using only those GRBs with measured redshifts in order to physically characterize these objects. We disentangle which differences are instrumental selection effects versus intrinsic properties in order to better understand the nature of the special characteristics of the LAT bursts.


The Astrophysical Journal | 2011

FERMIANDSWIFTGAMMA-RAY BURST AFTERGLOW POPULATION STUDIES

Judith Lea Racusin; S. R. Oates; Patricia Schady; D. N. Burrows; M. De Pasquale; Davide Donato; N. Gehrels; S. Koch; J. E. McEnery; Tsvi Piran; P. W. A. Roming; T. Sakamoto; C. A. Swenson; Eleonora Troja; V. Vasileiou; Francisco J. Virgili; D. Wanderman; Bin-Bin Zhang

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C. A. Swenson

Pennsylvania State University

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D. N. Burrows

Pennsylvania State University

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Davide Donato

Goddard Space Flight Center

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J. E. McEnery

Goddard Space Flight Center

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Judith Lea Racusin

Goddard Space Flight Center

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N. Gehrels

Goddard Space Flight Center

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P. W. A. Roming

Pennsylvania State University

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S. Koch

Pennsylvania State University

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