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Studying the most energetic explosions in the universe: Standard afterglow modeling of Gamma Ray Burst 050802

Semester: Summer 2023


Presentation description

Gamma-ray bursts (GRBs) are among the most energetic events in the universe, typically caused by the collision of supermassive objects and the collapse of very large stars. This can result in the ejection of very large quantities of matter and energy. The observed light from the remnants of these bursts, known as an afterglow, can be modeled according to the evolution of the brightness of each frequency of light as well as the type of environment that it travels through. We worked on modeling the afterglows of GRBs from the BAT6 sample, a collection of long duration GRBs with favorable observation conditions. We estimated and fitted physical parameters using inferences from the data and later running a Markov-Chain Monte-Carlo (MCMC) simulation to determine uncertainties on these parameters.|In this work we present the analysis and standard afterglow modeling of GRB 050802. The UV and X-ray temporal data obtained from the SWIFT/UVOT telescopes show several nonstandard effects at early times. After this time the data can be fitted with a power law consistent with the available optical data. Additionally, we observed evidence of brightness contribution from the host galaxy of the GRB at later times. We use this knowledge to fit a slow cooling interstellar medium model, explained in this work. Together with other analyzed GRBs, this work will help develop and better understand GRB modeling techniques.

Presenter Name: Gianlucas Sherrill Velarde

Presentation Type: Poster
Presentation Format: In Person
Presentation #110
College: Science
School / Department: Physics & Astronomy
Research Mentor: Tanmoy Laskar
Date | Time: Thursday, Aug 3rd | 10:30 AM