  It has been suggested that short gamma ray bursts (GRBs) have shorter or
undetectable spectral lags than long GRB because in the former, the observer's
line of sight makes a larger angle with the GRB jet axis than for the latter.
It is proposed that simultaneous gravitational wave - short GRB events could
provide a simple test of this hypothesis. Multimessenger astronomy eventually
may test whether event horizons are a necessary ingredient for GRB.
