The BTr and UBr satellites observed $beta$ Lyrae from May to October 2016 to continuously monitor light-curve instabilities with the time resolution of about 100 mins. An instrumental problem affecting localized patches on the BTr CCD detector has been discovered by comparison with partly simultaneous UBr observations; the origin of the problem is being investigated. A zero-point offset permits utilization of the BTr data for a time-series characterization of deviations from the mean light curve defined to $simeq 0.0025$ mag.
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