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Transient Absorption Features in GRBs and Their Implications for GRB Progenitors
M. Boettcher, C. L. Fryer, C. D. Dermer
The recent detection of a transient absorption feature in the prompt emission of GRB 990705 has sparked multiple attempts to fit this feature in terms of photoelectric absorption o…
Pair Production and Radiation Effects in Clouds Illuminated by Gamma Ray Sources
C. D. Dermer, M. Boettcher, E. P. Liang
Many classes of gamma-ray sources, such as gamma-ray bursts, blazars, Seyfert galaxies, and galactic black hole sources are surrounded by large amounts of gas and dust. X-rays and…
High-Energy Neutrino Production through Photopion Processes in Blazars
C. D. Dermer, A. Atoyan
The measured spectral energy distribution and variability time scale are used to determine the radiation and magnetic-field energy densities in the relativistic plasma that forms t…
An evolutionary scenario for blazar unification
M. Boettcher, C. D. Dermer
Blazar subclasses ranging from flat-spectrum radio quasars (FSRQs) through low-frequency-peaked BL Lac objects (LBLs) to high-frequency-peaked BL Lac objects (HBLs) exhibit a seque…
Ultra-High Energy Cosmic Rays and Neutron-Decay Halos from Gamma Ray Bursts
C. D. Dermer
Simple arguments concerning power and acceleration efficiency show that ultra-high energy cosmic rays (UHECRS) with energies >~ 10^{19} eV could originate from GRBs. Neutrons forme…