My student Mathias Ross and I have created a database of X-ray light curves of young supernovae. You can download data, create and download plots, and fit a power-law profile to the data. You can also upload your own data. The database is described in this paper.
Please upload your X-ray SN observations, to make the database as comprehensive as possible.
This can be accessed at kronos.uchicago.edu/snax
The database is currently being updated to the latest PhP version by undergraduate student Alexandra Nisenoff.