  We present results of analysis of observations of two transient sources IGR
J17091-3624 and IGR J18539+0727 in April 2003 with RXTE observatory. Obtained
energy spectra of sources, and also power spectra of their flux variations give
us a possibility to classify them as X-ray binary systems in low/hard spectral
state. Parameters of power spectrum of IGR J18539+0727 indicates that this
source is a black hole candidate.
