  The mass spectrum is calculated for those dileptons which are produced in the
early phase of a heavy ion collisions via the direct production NN ->
(l^+)(l^-)X and via the Compton process GN -> (l^+)(l^-)X with prompt gluons
radiated in preceding NN interactions. Both mechanisms produce a mass spectrum
which decreases steeply with invariant mass of the l^+l^- pair and which is
below the CERES data for Pb-Au collisions by about one order of magnitude.
