Sturgis Motorcycle Rally Reportedly Led To 260,000 COVID-19 Cases

San Diego State University researchers used cell phone data to track movements related to the Sturgis Rally in August, analyzing COVID-19 case numbers before and after the event. Their study reported higher case numbers than those reported by the South Dakota Health Department and The Associated Press. South Dakota's governor dismissed the study as fiction, claiming it was an attack on personal freedom.

What was the source of the data used in the study?

What was the time frame of the study in relation to the Sturgis Rally?