There have been four supernova seen in our galaxy in the last 1000 years
there have been two supernovae seen in our Galaxy in the last five hundred years, the first seen by Tycho Brahe in1572 and the second in 1604 by Johannes Kepler.
There was a Supernova in the LMC in 1987 which was naked eye
There have been in the last twenty years over 1000 supernovae discovered through various types of telescopes both by amateurs and professional.
I have seen about a dozen in scopes from 20cm to 70cm the last ten years
but discovered none
Ron