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We present a comprehensive sample of all gamma-ray burst (GRB) afterglows with known distances, and we derive their conical opening angles based on observed broadband breaks in their light curves.
A Study of the Afterglows of Four Gamma-Ray Bursts: Constraining the Explosion and Fireball Model
We employ a fireball model of the gamma-ray burst (GRB) explosion to constrain intrinsic and environmental parameters of four events with good broadband afterglow data: GRB 970508, GRB 980329, GRB
A common origin for cosmic explosions inferred from calorimetry of GRB030329
Radio observations of GRB030329 indicate a common origin for cosmic explosions in which the energy in the highest-velocity ejecta is extremely variable, and the contribution of the γ-rays is energetically minor.
The bright optical afterglow of the nearby γ-ray burst of 29 March 2003
Past studies of cosmological γ-ray bursts (GRBs) have been hampered by their extreme distances, resulting in faint afterglows. A nearby GRB could potentially shed much light on the origin of these
The sub-energetic γ-ray burst GRB 031203 as a cosmic analogue to the nearby GRB 980425
Over the six years since the discovery of the γ-ray burst GRB 980425, which was associated with the nearby (distance ∼40 Mpc) supernova 1998bw, astronomers have debated fiercely the nature of this
A Redshift Determination for XRF 020903: First Spectroscopic Observations of an X-Ray Flash
We report the discovery of optical and radio afterglow emission from the extremely soft X-ray flash XRF 020903. Our spectroscopic observations provide the first redshift for an X-ray flash, thereby
Discovery of Early Optical Emission from GRB 021211
We report our discovery and early-time optical, near-infrared, and radio wavelength follow-up observations of the afterglow of the gamma-ray burst GRB 021211. Our optical observations, beginning 21
GRB 061121: Broadband spectral evolution through the prompt and afterglow phases of a bright burst
Swift triggered on a precursor to the main burst of GRB 061121 (z = 1.314), allowing observations to be made from the optical to gamma-ray bands. Many other telescopes, including Konus-Wind,