The vibrational levels of O-2(X(3)Z(g)(-)) generated in the ultraviolet photolysis of O-3 at 266 nm were detected via laser-induced fluorescence (LIF) of the B-3 Sigma(-)(u) - X-3 Sigma(-)(g) system. The nascent vibrational energy distributions of O-2(X-3 Sigma(-)(g), v = 6-13) have been measured by two different methods. One is a kinetic analysis based on the originally developed integrated profiles method (IPM). The time-resolved LIF of a single vibrational level has been recorded in the presence of CF4 or O-2 as a relaxation partner. The IPM analysis of the profiles gave the relative detectabilities of adjacent vibrational levels, and the initial relative populations of the vibrational levels have been determined from the intensities of LIF subsequent to the photolysis. The other is the analysis of the area intensities of the LIF of the vibrational levels of interest. The rotational levels with the identical quantum numbers of different vibrational levels in the X-3 Sigma(-)(g) state were excited to a common vibrational level v = 0 in the B-3 Sigma(-)(u) state. Correction for the LIF intensities with the Franck-Condon factors was made, and the initial relative populations have been obtained. The two different methods have given similar nascent vibrational energy distributions, and comparison to the previous reports has been made.