Among active galactic nuclei, blazars show extreme variability properties. We here
investigate the case of the BL Lac object S4 0954+ 65 with data acquired in 2019–2020 by …

We present the results of a periodicity search of 20 intra-day variable optical light curves of
the blazar S5 0716+ 714, selected from a database of 102 light curves spanning over three …

We present recent optical photometric observations of the blazar OJ 287 taken during 2015
September–2016 May. Our intense observations of the blazar started in 2015 November …

We present the results of a long-term study designed to investigate the nature of micro-
variability in blazars carried out primarily at the Southeastern Association for Research in …

Context. The international Whole Earth Blazar Telescope (WEBT) consortium planned and
carried out three days of intensive micro-variability observations of S5 0716+ 714 from …

Aims. We address the topic of the intra-night optical variability of the BL Lac object S5 0716+
714. Methods. To this purpose a long-term observational campaign was carried out, from …

ABSTRACT The BL Lacertae object S5 0716+ 714 is one of the most studied blazars on the
sky due to its active variability and brightness in many bands, including very-high-energy …

We report the results of multiband optical photometric monitoring of two well-known blazars,
S5 0716+ 714 and BL Lacertae, carried out during 1996 and 2000–01 with an aim to study …

We report results from a one-week multiwavelength campaign to monitor the BL Lacertae
object (BL Lac) S5 0716+ 714 (on 2009 December 9–16). Nine ground-based telescopes at …

In this paper, using a database of the University of Michigan Radio Astronomy Observatory
at the radio frequencies (8 GHz and 14.5 GHz), we determined the variability time scales …