title: A bright millisecond radio burst of extragalactic origin.
abstract: Pulsar surveys offer a rare opportunity to monitor the radio sky for impulsive burst-like events with millisecond durations. We analyzed archival survey data and found a 30-jansky dispersed burst, less than 5 milliseconds in duration, located 3 degrees from the Small Magellanic Cloud. The burst properties argue against a physical association with our Galaxy or the Small Magellanic Cloud. Current models for the free electron content in the universe imply that the burst is less than 1 gigaparsec distant. No further bursts were seen in 90 hours of additional observations, which implies that it was a singular event such as a supernova or coalescence of relativistic objects. Hundreds of similar events could occur every day and, if detected, could serve as cosmological probes.
authors: Department of Physics, West Virginia University, Morgantown, WV 26506, USA. duncan.lorimer@mail.wvu.edu
authors: D R
authors: DR
authors: Lorimer
authors: M
authors: M
authors: Bailes
authors: M A
authors: MA
authors: McLaughlin
authors: D J
authors: DJ
authors: Narkevic
authors: F
authors: F
authors: Crawford