  A measurement of the pp --> p p eta reaction at the excess energy of Q = 15.5
+- 0.4 MeV has been carried out at the internal beam facility COSY-11 with an
integrated luminosity of 811 nb^-1 The number of ~24000 identified events
permits a precise determination of total (2.32 +- 0.05 +- 0.35 \mu b) and
differential cross sections. Preliminary investigations show that the angular
distribution of the eta meson in the center-of-mass system is isotropic. A
qualitative analysis of the Dalitz-plot distribution is presented.
