The BL Lacertae object, AP Librae, has been photometrically monitored in an effort to study the nature of optical variations which may occur on timescales less than a day. Rapid, large amplitude events have been observed with changes as large as 1.0 mag from night to night. The most rapid rate of change detected was 0.06+/-0.01 mag/hr. This is one of the most rapid, large amplitude events ever detected for a BL Lacertae object.
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Carini et al. (1991) studied this question.
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