GRB 990123: An Extraordinary Example of an Ordinary Gamma-Ray Burst?
R.M. Kippen, M.S. Briggs, R.D. Preece
J. van Paradijs
G.H. Share, R.J. Murphy
C. Winkler, O.R. Williams
M.L. McConnell, J.M. Ryan, C.A. Young
One of the most interesting gamma-ray burst discoveries in recent
years was the simultaneous detection of GRB 990123 at optical, X-ray
and gamma-ray wavelengths. Subsequent observations of this burst
revealed optical, X-ray and radio afterglow counterparts, which
eventually led to a redshift measurement, z ³ 1.6. During the
prompt emission phase, this burst was fortuitously observed by nearly
all the instruments on the Compton Observatory, providing us with a
detailed account of the gamma-ray emission properties. Although the
burst was a large event in terms of its gamma-ray flux and fluence,
its spectral properties are similar to the majority of the burst
population. We will review the gamma-ray spectral and temporal
properties of GRB 990123, concentrating on their relation to the full
burst population and their relation to the prompt optical emission.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.