Objects with black holes, including BL Lac objects, can show variability in their emission. The timescales of this variability can range from days to months or even years. This article studies variability of a BL Lac object that has shown variability with a timescale of a day. The results of this study can help astronomers better understand this BL Lac object.

http://www.raa-journal.org/raa/index.php/raa/article/view/1806