We were quite fortunate with John Wheeler introducing the concept of Black Hole (BH) and more important using the Kerrr mathematical solution to find the BH mass energy formula with Christodoulou and Hawking. We have been equally fortunate to participate in developing the largest observational effort extending to the earliest million years from the Big Bang and observing BH in all range of...
Supernovae are among the most energetic and luminous events in the universe, providing unique opportunities to study stellar evolution, nucleosynthesis, the dynamics of interstellar matter, and the physics of stellar remnants such as neutron stars and black holes. The next galactic supernova could offer unprecedented insights if we are adequately prepared to discover it. This paper briefly...
For nearly 30 years, Konus-Wind has been a tireless workhorse for high-energy astrophysics.In this talk, we provide an overview and recent results from Konus-Wind observations of short, long, and ultra-long gamma-ray busts, Galactic and extragalactic magnetars, and solar flares. The recent results include the detection of giant flares from extragalactic magnetars, the famous SGR/FRB 200428...
Recent observations of TeV emission from Gamma-Ray Bursts (GRBs)
demonstrated with certainty that it belongs to the afterglow phase. Afterglows' emission from radio frequencies to GeV gamma-rays is of synchrotron origin, whereas the TeV component is produced via distinct physical process (inverse Compton). Thus, TeV observations open an entirely new window into physics of relativistic shocks....
A gamma-ray burst (GRB) afterglow is considered an orphan when it is detected without a targeted search triggered by the prompt GRB emission. This can occur when the GRB jet points away from us or if the prompt emission along our line of sight is dim (e.g. a ``dirty fireball''). We present a semi-analytic model for the afterglow lightcurves based on and calibrated with numerical simulations....
