******************************************************
   PR # 41178
   It has been recently reported (Mathur & Elvis 1995) that the newly
   discovered radio-loud quasar GB1508+5714, with z=4.3, was observed
   serendipitously with the Einstein observatory. The source has a
   (0.3-3.5 keV) flux of about 10**-12 erg/cm2/s, more than 10 times
   brighter than the other two X-ray detected z>4 quasars. A
   hardness-ratio analysis indicates that the source is remarkably hard,
   or absorbed, but no spectral fitting is possible with the Einstein
   data. With a 40 Ks ASCA observation, we anticipate the determination
   of the spectral parameters (Nh, absorption, FeK) of this very distant
   quasar. These values, combined with previous results from high-z
   quasars (Cappi et al. 1995), will be compared to low-z quasars and
   radio-quiet quasars to study the evolution of quasars.
  ******************************************************