High z supernovae with the NGST

We use different assumptions for the combination of dust extinction and star formation up to redshifts z >= 5, as well as detailed modeling of supernova properties, to estimate the number of supernovae that should be observable with various instruments, in particular the NGST. In the model we use realistic light curves and spectral shapes that evolve with time for the different types supernovae. We find that the NGST should be able to detect several tens of core collapse SNe in a single detection if the observational limit in the range 1-5 microns is 1 nJy and the field is 16 sq. arcmin. We also estimate the observable number of Type Ia supernovae. Due to the time delay between the formation of the progenitor star and the explosion of the supernova, there are additional aspects that have to be considered when interpreting observational rates of these supernovae.