  The gravitational lensing of a relativistic fireball can produce the time
delayed multiple images with quite different spectra and temporal patterns in
contrast with a nonrelativistic source and hence can imitate the source
recurrence. In particular, the enigmatic four multiple gamma-ray bursts
detected during two days at October 1996 in the same sky region may be due to a
single fireball event multiply imaged by the foreground galactic nucleus or
cluster of galaxies.
