259 citations · 753 across the 14 of their papers we have counts for
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Constraints on the Gamma-ray Burst Luminosity Function from PVO and BATSE
Andrew Ulmer, Ralph A. M. J. Wijers, Edward E. Fenimore
We examine the width of the gamma-ray burst luminosity function through the distribution of GRB peak fluxes as detected by the Pioneer Venus Orbiter (PVO) and the Burst and Transie…
Super-Eddington Radiation Transfer in Soft Gamma Repeaters
Andrew Ulmer
Bursts from soft gamma repeaters have been shown to be super-Eddington by a factor of 1000 and have been persuasively associated with compact objects. Here, a model of super-Edding…
The Width of the Gamma-ray Burst Luminosity Function
Andrew Ulmer, Ralph A. M. J. Wijers
We examine the width of the gamma-ray burst (GRB) luminosity function through the distribution of GRB peak count rates, C, as detected by BATSE (\cite{batse:93}). In…
Femtolensing: Beyond the Semi-Classical Approximation
A. Ulmer, J. Goodman
Femtolensing is a gravitational lensing effect in which the magnification is a function not only of the positions and sizes of the source and lens, but also of the wavelength of li…
The X-ray Spectrum of Soft Gamma Repeater 1806-20
E. E. Fenimore, J. G. Laros, A. Ulmer
Soft Gamma Repeaters (SGRs) are a class of rare, high-energy galactic transients that have episodes of short (~0.1 sec), soft (~30 keV), intense (~100 Crab), gamma-ray bursts. We r…
Gamma-Rays from Grazing Incidence Cosmic Rays in the Earth's Atmosphere
Andrew Ulmer
Interactions of grazing incidence, ultra high energy cosmic rays with the earth's atmosphere may provide a new method of studying energetic cosmic rays with gamma-ray satellites. I…