I am interested in Schur covers of minimal 2-transitive groups. A theorem of Burnside gives that every finite 2-transitive group is either almost simple or affine. In the time since, these groups have been classified as a consequence of the classification of finite simple groups (see Section 2 of this paper, for example). Since Schur covers were already determined for the simple groups in order to perform their classification, the Schur covers of almost simple groups are relatively easy to obtain. By contrast, I am having difficulty finding the Schur covers in the affine case.

**Question:** Where can I find descriptions of the Schur covers of minimal affine 2-transitive groups?

A good answer looks like:

"The Schur cover of PSL(n,q) is SL(n,q), with a few exceptions. See Karpilovsky, The Schur Multiplier, p.246."

but with a minimal affine 2-transitive group in place of PSL(n,q).

The following appear related, but are not what I'm asking for:

"What is the Schur multiplier of the affine linear group AGL(n,q)?" computes the Schur multiplier of AGL(n,q). However, AGL(n,q) is not a minimal 2-transitive group, and I want a Schur cover, not just the multiplier.

"Have finite doubly transitive groups been classified?" discusses the classification of affine 2-transitive groups at length. It does not mention Schur multipliers or covering groups.