5 papers · 1 filter
GRB990123: The Case for Saturated Comptonization
E. P. Liang, A. Crider, M. Boettcher +1
The recent simultaneous detection of optical, X-ray and gamma-ray photons from GRB990123 during the burst provides the first broadband multi-wavelength characterization of the burs…
Observations of GX 339-4 in 1996
I. A. Smith, E. P. Liang, D. Lin +9
GX 339-4 is an unusual black hole candidate in that it is a persistent source, being detected by X-ray telescopes most of the time, but it also has nova-like flaring states. In 199…
Spectral Hardness Decay with Respect to Fluence in BATSE Gamma-Ray Bursts
A. Crider, E. P. Liang, R. D. Preece +5
We have analyzed the evolution of the spectral hardness parameter Epk as a function of fluence in gamma-ray bursts. We fit 41 pulses within 26 bursts with the trend reported by Lia…
Time-dependent photoelectric absorption, photoionization and fluorescence line emission in gamma-ray burst environments
M. Boettcher, C. D. Dermer, A. W. Crider +1
If gamma-ray bursts are associated with dense star-forming regions in young galaxies, photoelectric absorption by the dense circumburster material (CBM) will occur. As the burst ev…
Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts
A. Crider, E. P. Liang, I. A. Smith +6
We report evidence that the asymptotic low-energy power law slope alpha (below the spectral break) of BATSE gamma-ray burst photon spectra evolves with time rather than remaining c…