  The F-type star KIC 8462852 has recently been identified as an exceptional
target for SETI (search for extraterrestrial intelligence) observations. We
describe an analysis methodology for optical SETI, which we have used to
analyse nine hours of serendipitous archival observations of KIC 8462852 made
with the VERITAS gamma-ray observatory between 2009 and 2015. No evidence of
pulsed optical beacons, above a pulse intensity at the Earth of approximately 1
photon per m^2, is found. We also discuss the potential use of imaging
atmospheric Cherenkov telescope arrays in searching for extremely short
duration optical transients in general.
