RX J0947.0+4721 is a newly discovered example of a narrow–line Seyfert 1 type object with a quasar level luminosity ( M _ { B } = -24.8 ) .
It was detected in the ROSAT All–Sky Survey ( RASS ) and later in 17 pointed observations of the ROSAT Position sensitive Proportional Counter ( PSPC ) .
The optical spectrum contains strong FeII emission .
We apply several spectral models to the X–ray data .
A single power law fit yields a photon index \Gamma = -4.2 .
Single component thermal models underestimate the flux above 1 keV .
A good fit is obtained with a blackbody plus power law model ( \Gamma = 1.7 fixed ) modified by Galactic absorption .
The best fit temperature is T _ { bb } = 108 \pm 8 eV , and the flux ratio in the ROSAT band is f _ { bb } / f _ { pl } = 6 .
Large count rate variations are visible with a maximum amplitude of a factor > 17.5 .
The fastest change is a drop of a factor 2.7 in 25 hours .
No spectral variations were observed .
The maximum and minimum luminosities in the two component model are 1.0 \cdot 10 ^ { 46 } \mbox { $ ergs s ^ { -1 } $ } and < 6 \cdot 10 ^ { 44 } \mbox { $ ergs s ^ { -1 } $ } , respectively .
We discuss possible explanations for the extreme softness and the observed variability .