Blazars are very broadband cosmic sources with spectra spanning over twenty orders of
magnitude in frequency, down to the 100 MHz regime in the radio range, up to VHE at …

The last few years have seen gamma-ray astronomy maturing and advancing in the field of
time-domain astronomy, utilizing source variability on timescales over many orders of …

We present our observations of electromagnetic transients associated with GW170817/GRB
170817A using optical telescopes of Chilescope observatory and Big Scanning Antenna …

The observation of the IceCube-170922A event from the direction of TXS 0506+ 056 when it
was in its enhanced γ-ray emission state offers a unique opportunity to investigate the lepto …

In this work, a time-dependent modelling is developed to study the emission properties of
blazars in the low state. Motivated by various observations, we speculate and assume that …

Recent observations with ALMA have revealed evidence for nonthermal synchrotron
emission from the core regions of two nearby Seyfert galaxies. This suggests that the …

We investigate the dynamics and emission of a starved magnetospheric region (gap) formed
in the vicinity of a Kerr black hole horizon, using a new, fully general relativistic particle-in …

The recent hint of correlated γ-ray and neutrino emission from the blazar TXS 0506+ 056
has renewed interest in blazars as the source of high-energy neutrinos, in which the …

Radio Galaxies have by now emerged as a new γ-ray emitting source class on the
extragalactic sky. Given their remarkable observed characteristics, such as unusual gamma …

This is the second paper in a series where we examine the physics of pair producing gaps in
low-luminosity accreting supermassive black hole systems. In this paper, we carry out time …