THE ASCA SPECTRUM OF THE Z=4.72 BLAZAR GB-1428+4217

The X-ray-luminous quasar GB 1428+4217 at redshift 4.72 has been obser ved with ASCA. The observed 0.5-10 keV flux is 3.2 x 10(-12) erg cm(-2 )s(-1). We report here on the intrinsic 4 - 57 keV X-ray spectrum, whi ch is very flat (photon index 1.29). We find no evidence for flux vari ability within the ASCA data set or between it and ROSAT data. We show that the overall spectral energy distribution of GB 1428+4217 is simi lar to that of lower redshift MeV blazars, and present models that fit the available data. The Doppler beaming factor is likely to be at lea st 8. We speculate on the number density of such high-redshift blazars , which must contain rapidly formed massive black holes.