It may have been a rocket - will the IDF respond?

It is now being reported that what was fired from Gaza on Israel around 6:30 this evening was a rocket and not a mortar.

There have been mixed reports on the precise nature of the projectile fired, with Channel 10 saying
the attack was a mortar shell as opposed to a rocket; likewise, IDF
spokesperson Lt. Col. Peter Lerner labeled it a mortar shell on the
IDF's official Twitter feed.