I am not. I have no interest in mass shootings. I track spree killings. (That is to say killings of four or more people in a single emotional event by a single killer in a single emotional event.) It is possible to shift through a list of mass killings and get all the mass school or other shootings that result in more than four deaths, but that is not my interest.
But mass school shootings would (I suppose) be those were four or more people were hit (not killed) in a school in session. They are very rare events.
It is simply sad that in our modern America we have as many names for killings as the Inuit (supposedly) have for snow.