We report the results of a systematic timing analysis of all archival Rossi X-Ray Timing Explorer ( RXTE ) observations of the bright black-hole binary GRS 1915+105 in order to detect high-frequency quasi-periodic oscillations ( HFQPO ) .
We produced power-density spectra in two energy bands and limited the analysis to the frequency range 30-1000 Hz .
We found 51 peaks with a single trial significance larger than 3 \sigma .
As all but three have centroid frequencies that are distributed between 63 and 71 Hz , we consider most of them significant regardless of the number of trials involved .
The average centroid frequency and FWHM are 67.3 \pm 2.0 Hz and 4.4 \pm 2.4 Hz respectively .
Their fractional rms varies between 0.4 % and 2 % ( total band detections ) and between 0.5 % and 3 % ( hard ban detections ) .
As GRS 1915+105 shows large variability on time scales longer than 1s , we analysed the data in 16s intervals and found that the detections are limited to a specific region in the colour-colour diagram , corresponding to state B of the source , when the energy spectrum is dominated by a bright accretion disk component .
However , the rms spectrum of the HFQPO is very hard and does not show a flattening up to 40 keV , where the fractional rms reaches 11 % .
We discuss our findings in terms of current proposed models and compare them with the results on other black-hole binaries and neutron-star binaries .