| Name: | Hima Thomas |
| Affiliation: | St Joseph's University |
| Conference ID : | ASI2024_393 |
| Title : | Multiwavelength population study of the Fermi detected GRBs |
| Authors : | Hima Thomas, Dr Sunil Chandra |
| Authors Affiliation: | 1 Hima Thomas St Joseph's University, Bangalore-560027, India
2 Dr Sunil Chandra South African Astronomical Observatory, Cape Town-7925, South Africa
|
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Gamma-ray bursts (GRBs) are short and intense bursts of 100 keV - 1MeV
photons, while for some sub-groups it is followed by a long-lasting decaying
afterglow emission in a wide range of electromagnetic wavelengths: from radio to
X-ray and, sometimes, even to GeV gamma-rays. It is believed to be originated
from kilonovae (binary mergers like a neutron-neutron star or a neutron star and
a blackhole). Some gamma-ray bursts (GRBs) last for only a fraction of a second
and some as long as a minute or sometimes even a few hours, they produce
huge amounts of energy (10^51 ergs) thus making them the most powerful class
of explosions in the universe. The overall consensus regarding GeV/TeV GRBs
suggests that they exhibit a shallow decay phase, with their decay slope typically
being steeper compared to non-GeV/TeV bursts. This implies the presence
of a shallow decay phase in the initial X-ray afterglow. Additionally, certain
long duration GRBs display X-ray bumps, indicating extended central engine
activities, such as late X-ray flares, which are likely caused by the reentry of
materials from the progenitor envelope. In this paper we compare the properties
of TeV emitting and non-TeV emitting GRBs and to understand the intrinsic
differences if any. A large sample of GRBs taken from Fermi LAT Second
Gamma-Ray Burst Catalog is used to perform property based population study.
We are also using Swift-BAT (15-150 keV) database for GRBs to co-relate with
GRBs from X-ray and gamma ray triggers. We are also emphasizing on the
multi-wavelength properties of the historic TeV-emitting GRBs.
|
