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GRB Energetics in the Swift Era
Daniel Kocevski, Nathaniel Butler
We examine the rest frame energetics of 76 gamma-ray bursts (GRBs) with known redshift that were detected by the Swift spacecraft and monitored by the satellite's X-ray Telescope (…
A Complete Catalog of Swift GRB Spectra and Durations: Demise of a Physical Origin for Pre-Swift High-Energy Correlations
Nathaniel R. Butler, Daniel Kocevski, Joshua S. Bloom +1
We calculate durations and spectral paramaters for 218 Swift bursts detected by the BAT instrument between and including GRBs 041220 and 070509, including 77 events with measured r…
The Troublesome Broadband Evolution of GRB 061126: Does a Grey Burst Imply Grey Dust?
D. A. Perley, J. S. Bloom, N. R. Butler +18
We report on observations of a gamma-ray burst (GRB 061126) with an extremely bright (R ~ 12 mag at peak) early-time optical afterglow. The optical afterglow is already fading as a…
X-ray Hardness Variations as an Internal/External Shock Diagnostic
Nathaniel R. Butler, Daniel Kocevski
The early, highly time-variable X-ray emission immediately following GRBs exhibits strong spectral variations that are unlike the temporally smoother emission which dominates after…
Pulse Width Evolution of Late Time X-rays Flares in GRBs: Evidence For Internal Shocks
Daniel Kocevski, Nathaniel Butler, Joshua S. Bloom
We study the duration and variability of late time X-ray flares following gamma-ray bursts (GRBs) observed by the narrow field X-ray telescope (XRT) aboard the {\it Swift} spacecra…