  The ATLAS experiment observed an excess at the $3\sigma$ level in the channel
of $Z$ boson, jets and high missing transverse momentum in the full 2012
dataset at 8 TeV while searching for SUSY. The question arises whether the
abundance and the kinematical features of this excess are compatible with the
yet unconstrained supersymmetric realm, respecting at the same time the
measured Higgs boson properties and dark matter density. By trying to explain
this signal with SUSY we find that only relatively light gluinos together with
a heavy neutralino NLSP decaying predominantly to a $Z$ boson plus a light
gravitino could reproduce the excess. We construct an explicit general gauge
mediation model able to match the observed signal. More sophisticated models
could also reproduce the signal, as long as it features light gluinos, or heavy
particles with a strong production cross section, producing at least one $Z$
boson in its decay chain. The implications of our findings for the Run II at
LHC with the scaling on the $Z$ peak, as well as for the direct search of
gluinos and other SUSY particles, are also discussed.
