Abstract Very high energy\(\gamma\)-rays are one of the most important messengers of the
relativistic non-thermal Universe. The major motivation of very high energy\(\gamma\)-ray …

Aims. We aim to characterize the multiwavelength emission from Markarian 501 (Mrk 501),
quantify the energy-dependent variability, study the potential multiband correlations, and …

This paper presents the results of a detailed X-ray timing and spectral analysis of Mrk 501,
which are based mainly on the Swift data obtained during 2021 February–2022 December …

Context. The multi-wavelength (MWL) properties of some TeV-detected blazars are still
poorly understood. By studying the MWL properties of the BL Lacertae source 1ES 0033+ …

Aims. The nearby TeV blazar 1ES 1959+ 650 (z= 0.047) was reported to be in flaring state
during June–July 2016 by Fermi-LAT, FACT, MAGIC and VERITAS collaborations. We …

Aims. Radio-to-TeV observations of the bright nearby (z= 0.034) blazar Markarian 501 (Mrk
501), performed from December 2012 to April 2018, are used to study the emission …

We present the detailed timing and spectral results obtained during the Swift observations of
the TeV-detected blazar 1ES 1959+ 650 in 2016 August–2017 November. The source …

Mrk 501 is a prototypical high-synchrotron-peaked blazar and serves as one of the primary
targets for the Imaging X-ray Polarimetry Explorer (IXPE). In this study, we report X-ray …

We present the results of the Swift observations of the nearby BL Lac object Mrk 421 during
2013 November–2015 June. The source exhibited a strong long-term variability in the 0.3 …

BL Lac objects are active galactic nuclei notable for a beamed nonthermal radiation, which
is generated in one of the relativistic jets forming a small angle to the observer's line-of-sight …