  On January 6th 2004, the IBAS burst alert system triggered the 8th gamma-ray
burst (GRB) to be located by the INTEGRAL satellite. The position was
determined and publicly distributed within 12s, prompting ESA's XMM-Newton to
execute a ToO observation just 5 hours later, during which an X-ray afterglow
was detected. The GRB had a duration ~52s with two distinct pulses separated by
\~42s. Here we present the results of imaging and spectral analyses of the
prompt emission from INTEGRAL data and the X-ray afterglow from XMM-Newton
data. The gamma-ray spectrum is consistent with a single power-law of photon
index -1.72 +/- 0.15. The fluence (20-200 keV) was 8.2 x 10^-7 erg cm^-2. The
X-ray afterglow (F_nu (t) propto nu^-beta_X t^-delta) was extremely hard with
beta_X = 0.47 +/- 0.01 and delta = 1.46 +/- 0.04. The 2-10 keV flux 11 hours
after the burst was 1.1 x 10^-12 erg cm^-2 s^-1. The time profile of the GRB is
consistent with the observed trends from previous analysis of BATSE GRBs. We
find that the X-ray data are not well-fit by either a simple spherical fireball
or by a speading jet, expanding into a homogeneous medium or a wind
environment. Based on previously determined correlations between GRB spectra
and redshift, we estimate a redshift of ~0.9^+0.5_-0.4 (1 sigma) and a lower
limit on the isotropic radiated energy of ~5 x 10^51 erg in this burst.
