  The recent discovery of a kilonova from the long duration gamma-ray burst,
GRB 211211A, challenges classification schemes based on temporal information
alone. Gamma-ray properties of GRB 211211A reveal an extreme event, which
stands out among both short and long GRBs. We find very short variations (few
ms) in the lightcurve of GRB 211211A and estimate ~1000 for the Lorentz factor
of the outflow. We discuss the relevance of the short variations in identifying
similar long GRBs resulting from compact mergers. Our findings indicate that in
future gravitational wave follow-up campaigns, some long duration GRBs should
be treated as possible strong gravitational wave counterparts.
