[en] The MISO telescope was used to study the region of the sky containing NG 4151 on 30 September 1979 between 15h 01 U.T. and 20H 40 U.T. Experimental conditions are given. A mean value of 3.6 +- 0.9 count s^-1 was found for the low energy gamma-ray excess above 260 MeV when the data from the five drift scans taken were measured. A correlation made between the counting rate excess and the angular distance between the estimated direction of Seyfert galaxy NGC 4151 and the axis of the MISO telescope is shown. The data points to the detected excess originating from NGC 4151. The same method of analysis was repeated for the counts contained within seven energy-loss channels between 20 KeV and 19 MeV. The energy-loss spectrum was converted to a photon spectrum. From the MISO data there is some evidence that NG 4151 is variable at gamma-ray wavelengths. The gamma-ray luminosity has apparently varied by more than a factor of four over a two year period. The ultraviolet emission shows intensity fluctuations of a similar amplitude and time scale. It is suggested that there is a compact object in the nucleus of NGC 4151 if the X- and gamma-ray fluxes both originate from this region. (U.K.)