The third catalog of high-energy gamma-ray sources detected by the EGRET telescope on
the Compton Gamma Ray Observatory includes data from 1991 April 22 to 1995 October 3 …

Flat-spectrum radio quasars (FSRQs) and BL Lac objects detected in the first three months
of the Fermi survey neatly separate in the γ-ray spectral index versus γ-ray luminosity plane …

We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by
24 telescopes in 11 countries. More than 15 000 observations were performed in that period …

The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to
December and for 26 hr during 2006 July to September. The source is the historical …

Aims. Since the CGRO operation in 1991–2000, one of the primary unresolved questions
about the blazar γ-ray emission has been its possible correlation with the low-energy (in …

The γ-ray blazar 3C 279 was monitored on a nearly daily basis with IUE, ROSAT, and
EGRET for 3 weeks between 1992 December and 1993 January. During this period, the …

Context. We investigate the optical polarization properties of high-energy BL Lac objects
using data from the RoboPol blazar monitoring program and the Nordic Optical Telescope …

Aims. In a previous study we suggested that the broad-band emission and variability
properties of BL Lacertae can be accounted for by a double synchrotron emission …

We present the results of an extensive analysis of the optical, ultraviolet, X-ray, and γ-ray
data collected from the observations of the BL Lac objects prototype BL Lacertae carried out …

This paper reports on the X-ray emission from BL Lacertae during its 1997 July outburst as
observed with the Rossi X-Ray Timing Explorer (RXTE), compares the RXTE data with …