I do not want to enter into a debate about this, as I said, "most" of the time when you are audited by the State Taxing Agency or by the IRS, the other agency will look at the audit report and if there if there additional tax (that exceeds their tolerances) you will get a audit report from the other taxing agency.
In your case, if you were audited by the State for income tax (and if there was a substantial tax change that also impacts the Federal return), you should at some point in the future get a letter with a IRS audit report. It can take many months from the State audit for the IRS to send out the Federal audit report.
I worked for IRS for 34 1/2 years, and part of that time I was a Fed/State coordinator that made sure these reports were shared. I also was in charge of correspondence audit at another point in my career.
