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Paper: Optical Monitoring of BL Lac in 1997-1998
Volume: 159, BL Lac Phenomenon
Page: 145
Authors: Tosti, G.; Massaro, E.; Takalo, L. O.; Villata, M.; Kurtanidze, O. M.; Nikolashvili, M. G.
Abstract: A coordinated optical monitoring of BL Lac was carried out by the Perugia, Rome, Turin and Tuorla groups, during the great 1997 outburst to study multiband characteristics of its variability. The source was observed at the higher level of luminosity ever recordered over the past 25 years. Large amplitude variations have been observed from day-to-day and more faster ones, having amplitudes greater than 0.5 mag and timescales of a few hours, are often superimposed to the longer fluctuations.
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