  The Gamma-Ray burst detector on Ginga consisted of a proportional counter to
observe the x-rays and a scintillation counter to observe the gamma-rays. It
was ideally suited to study the x-rays associated with gamma-ray bursts (GRBs).
Ginga detected 120 GRBs and 22 of them had sufficient statistics to determine
spectra from 2 to 400 keV. Although the Ginga and BATSE trigger criteria were
very similar, the distribution of spectral parameters was different. Ginga
observed bend energies in the spectra down to 2 keV and had a larger fraction
of bursts with low energy power law indexes greater than zero. The average
ratio of energy in the x-ray band (2 to 10 keV) compared to the gamma-ray band
(50 to 300 keV) was 24%. Some events had more energy in the x-ray band than in
the gamma-ray band. One Ginga event had a period of time preceding the gamma
rays that was effectively pure x-ray emission. This x-ray ``preactivity'' might
be due to the penchant for the GRB time structure to be broader at lower energy
rather than a different physical process. The x-rays tend to rise and fall
slower than the gamma rays but they both tend to peak at about the same time.
This argues against models involving the injection of relativistic electrons
that cool by synchrotron radiation.
