Ethan, Sheila We ran BruCo over 10 minutes worth of data during yesterday's unexplained range drop. No channels had significant unexpected coherence with DELTAL_EXTERNAL. The summary of results is located here. An analysis with LASSO is next on the agenda.
To avoid duplication of effort, I want to point out Beverly's note in alog 52998, the daily summary page version of LASSO did analyze this range drop: https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20191104/detchar/lasso/