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Gamma-Ray Burst Arrival-Time Localizations: Simultaneous Observations by Ulysses, Pioneer Venus Orbiter, SIGMA, WATCH, and PHEBUS
K. Hurley, J. Laros, S. Brandt +11
Between the launch of the Ulysses spacecraft in 1990 October and the entry of Pioneer Venus Orbiter (PVO) into the atmosphere of Venus in 1992 October, concurrent coverage by Ulyss…
Pulse Width Evolution in GRBs: Evidence for Internal Shocks
E. Ramirez-Ruiz, E. E. Fenimore
Many cosmological models of GRBs envision the energy source to be a cataclysmic stellar event leading to a relativistically expanding fireball. Particles are thought to be accelera…
Gamma-Ray Bursts as Internal Shocks Caused By Deceleration
E. E. Fenimore, E. Ramirez-Ruiz
Gamma-ray bursts (GRBs) have been thought to originate from internal shocks that occur about 10^{15} cm from a central site. The shells responsible for these shocks merge together…
Resonant Cyclotron Radiation Transfer Model Fits to Spectra from Gamma-Ray Burst GRB870303
P. E. Freeman, D. Q. Lamb, J. C. L. Wang +5
We demonstrate that models of resonant cyclotron radiation transfer in a strong field (i.e. cyclotron scattering) can account for spectral lines seen at two epochs, denoted S1 and…
Statistical Analysis of Spectral Line Candidates in Gamma-Ray Burst GRB870303
P. E. Freeman, C. Graziani, D. Q. Lamb +4
The Ginga data for the gamma-ray burst GRB870303 exhibit low-energy dips in two temporally distinct spectra, denoted S1 and S2. S1, spanning 4 s, exhibits a single line candidate a…
The Observational Basis for Central Engines in Gamma Ray Bursts
E. E. Fenimore, E. Ramirez-Ruiz
We review the observational differences between gamma-ray bursts occurring on a single shell (such as in the external shock model) and multiple shells (such as in the internal shoc…