BeppoSAX observations of PKS 0528+134

We report on the BeppoSAX observations of the γ-ray blazar PKS 0528+134 performed in Feb and Mar 1997, during a multiwavelength campaign involving EGRET and ground based telescopes. The source was in a faint and hard state, with energy spectral index α = 0.48 ± 0.04 between 0.1 and 10 keV, and [2–10] keV flux of 2.7 × 10−12 erg cm−2 s−1. No significant variability was observed. The source was detected in the 20–120 keV band by the PDS, with a flux lying slightly above the extrapolation from lower X-ray energies. Comparing this low state with previous higher states of the source, there is an indication that the X-ray spectrum hardens and the γ-ray spectrum steepens when the source is fainter.