MULTIFREQUENCY OBSERVATIONS OF KAZ-102 DURING THE ROSAT ALL-SKY SURVEY

The bright quasar Kaz 102, which lies in the vicinity of the North Ecl iptic Pole, was monitored during the ROSAT All Sky Survey for 121.5 da ys from 1990 July 30 to 1991 January 25. In the course of the survey, optical photometry with various filters was performed at several epoch s, together with UV (IUE) and optical spectrophotometry. The spectral energy distribution in the 3 x 10(14)-3 x 10(17) Hz range is obtained simultaneously among the various frequencies to less than or similar t o 1 day. No clear case of variability can be made in the X-rays, while in the optical and UV variability of 10%-20% is apparent. An analysis of IUE and Einstein archives indicates a doubling timescale of years for the UV and soft X-ray flux. The X-ray photon index, which in 1979 was rather flat (Gamma = 0.8(-0.4)(+0.6)), in 1990/1991 was found to b e Gamma = 2.22 +/- 0.13, a typical value for radio-quiet quasars in th is energy range. The overall energy distribution and the variability a re discussed.