New images of the Supernova Remnants ( SNRs ) G114.3+0.3 , G116.5+1.1 and G116.9+0.2 ( CTB 1 ) are presented at 408 MHz from the Canadian Galactic Plane Survey ( CGPS ) .
We also use the 1420 MHz images from the CGPS to study their 408-1420 MHz spectral indices .
The flux densities at 408 MHz and 1420 MHz , corrected for flux densities from compact sources within the SNRs , are 12 \pm 6 Jy and 9.8 \pm 0.8 Jy for G114.3+0.3 , 15.0 \pm 1.5 Jy and 10.6 \pm 0.6 Jy for G116.5+1.1 , 15.0 \pm 1.5 Jy and 8.1 \pm 0.4 Jy for G116.9+0.2 .
The integrated flux density-based spectral indices ( S _ { \nu } \propto \nu ^ { - \alpha } ) are \alpha =0.16 \pm 0.41 , 0.28 \pm 0.09 and 0.49 \pm 0.09 for G114.3+0.3 , G116.5+1.1 and G116.9+0.2 , respectively .
Their T-T plot-based spectral indexes are 0.68 \pm 0.48 , 0.28 \pm 0.15 , and 0.48 \pm 0.04 , in agreement with the integrated flux density-based spectral indices .
New flux densities are derived at 2695 MHz which are significantly larger than previous values .
The new 408 , 1420 and 2695 MHz flux densities and published values at other frequencies , where images are not available , are fitted after correcting for contributions from compact sources , to derive their multi-frequency spectral indices .