A. D. Cason
A5016946210- Gamma-ray bursts and supernovae
- Smart Grid and Power Systems
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Mitochondrial Function and Pathology
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Solar and Space Plasma Dynamics
In this paper we investigate the properties of SN 2009E, which exploded in a relatively nearby spiral galaxy (NGC 4141) and that is probably faintest 1987A-like supernova discovered so far. Spectroscopic observations started about 2 months after explosion, highlight significant differences between 2009E prototypical 1987A. Modelling data allows us to constrain explosion parameters progenitor star, compare inferred estimates with those available for similar SNe 1987A 1998A. The light curve...
Here we report on the results of WEBT photo-polarimetric campaign targeting blazar S5~0716+71, organized in March 2014 to monitor source simultaneously BVRI and near IR filters. The resulted an unprecedented dataset spanning $\sim 110$\,h nearly continuous, multi-band observations, including two sets densely sampled polarimetric data mainly R filter. During campaign, displayed pronounced variability with peak-to-peak variations about $30\%$ "bluer-when-brighter" spectral evolution,...
The occurrence of low-amplitude flux variations in blazars on hourly timescales, commonly known as microvariability, is still a widely debated subject high-energy astrophysics. Several competing scenarios have been proposed to explain such occurrences, including various jet plasma instabilities leading the formation shocks, magnetic reconnection sites, and turbulence. In this Letter, we present results our detailed investigation prominent, five-hour-long optical microflare detected during...