Aims: The BL Lac object RGB 1745+398 lies in an environment that makes it possible to study the cluster around it more deeply than the environments of other BL...
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PublicationClustering environment of BL Lacertae object RGB 1745+398
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PublicationConstraints on redshifts of blazars from extragalactic background light attenuation using Fermi-LAT data
The extragalactic high-energy γ-ray sky is dominated by blazars, which are active galactic nuclei with their jets pointing towards us. Distance measurements are...
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PublicationCoordinated Multiwavelength Observation of 3C 66A during the WEBT Campaign of 2003-2004
The BL Lac object 3C 66A was the target of an extensive multiwavelength monitoring campaign from 2003 July through 2004 April (with a core campaign from 2003...
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PublicationCoordinated visible and infrared monitoring of rapid variations of Markarian 501 - First results with FOVIA
The paper presents simultaneous monitoring of the BL Lacertae object Markarian 501 obtained in the visible and near infrared using a double photometer system on...
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PublicationCorrection to: The relation between optical and γ-ray emission in BL lac sources
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PublicationDetection of an intranight optical hard lag with colour variability in blazar PKS 0735+178
Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight...
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PublicationDetection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state
Aims: The very high energy (VHE ≳100 GeV) γ-ray MAGIC observations of the blazar S4 0954+65, were triggered by an exceptionally high flux state of emission in...
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PublicationDetection of Very High Energy Radiation from the BL Lacertae Object PG 1553+113 with the MAGIC Telescope
In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553+113. The overall significance of the...
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PublicationDiscovery of a Very High Energy Gamma-Ray Signal from the 3C 66A/B Region
The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 hr in 2007 August-December. The observations resulted in the discovery of a γ...