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We describe results of a numerical calculation of circularly symmetric scalarfield collapse in three spacetime dimensions with negative cosmologicalconstant. The procedure uses a double null formulation of the Einstein-scalarequations. We see evidence of black hole formation on first implosion of ascalar pulse if the initial pulse amplitude $A$ is greater than a criticalvalue $A_*$. Sufficiently near criticality the apparent horizon radius $r_{AH}$grows with pulse amplitude according to the formula $r_{AH} \sim(A-A_*)^{0.81}$.Comment: 10 pages, 1 figure; references added, to appear in CQG(L

Scalar field collapse in three-dimensional AdS spacetime