  High-resolution specific-heat measurements of the organic superconductor
kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br in the superconducting (B = 0) and normal (B =
14 T) state show a clearly resolvable anomaly at Tc = 11.5 K and an electronic
contribution, Ces, which can be reasonably well described by strong-coupling
BCS theory. Most importantly, Ces vanishes exponentially in the superconducting
state which gives evidence for a fully gapped order parameter.
