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We present cosmological analysis of 12 nearby ($z<0.06$) Type IIP supernovae(SNe IIP) observed with the ROTSE-IIIb telescope. To achieve precisephotometry, we present a new image differencing technique that is implementedfor the first time on the ROTSE SN photometry pipeline. With this method, wefind up to a 20\% increase in the detection efficiency and significantreduction in residual RMS scatter of the SN lightcurves when compared to theprevious pipeline performance. We use the published optical spectra andbroadband photometry of well studied SNe IIP to establish temporal models forejecta velocity and photospheric temperature evolution for our SNe IIPpopulation. This study yields measurements that are competitive to othermethods even when the data are limited to a single epoch during thephotospheric phase of SNe IIP. Using the fully reduced ROTSE photometry andoptical spectra, we apply these models to the respective photometric epochs foreach SN in the ROTSE IIP sample. This facilitates the use of the ExpandingPhotosphere Method (EPM) to obtain distance estimates to their respective hostgalaxies. We then perform cosmological parameter fitting using these EPMdistances from which we measure the Hubble constant to be$72.9^{+5.7}_{-4.3}~{\rm kms^{-1}~Mpc^{-1}}$, which is consistent with thestandard $\Lambda CDM$ model values derived using other independent techniques.

Cosmological Distance Measurement of 12 Nearby Supernovae IIP with ROTSE-IIIB