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Physics GAPP: A structured jet model for GRB 080710: explaining the achromatic
Add to Calendar 2024-04-02T18:00:00 2024-04-02T19:00:00 UTC Physics GAPP: A structured jet model for GRB 080710: explaining the achromatic 339 Davey Laboratory
Start DateTue, Apr 02, 2024
2:00 PM
End DateTue, Apr 02, 2024
3:00 PM
Presented By
Kaori Obayashi, Aoyama Gakuin University
Event Series: GAPP Seminar

Gamma-ray bursts (GRBs) are the most luminous explosions in the electromagnetic phenomena. They are the sudden release of gamma rays emissions with their energy of typically several hundreds of keV, and with the duration ranging from milliseconds to hundreds of seconds. The GRBs are observed as point sources in the sky several times a day. Observationally, the prompt emissions, which are the main part of GRBs, are followed by multi-wavelength afterglows. These emissions are thought to be observed by front on-axis viewing of the relativistic jet which is emitted from the central engine.The luminosity of GRB 080710 detected by Swift/BAT is comparable to typical GRB prompt emissions. However, this event’s optical and near-infrared afterglow light curve is exceptional in that bright and achromatic peak at about 10^3 sec. In this study, we consider a structured jet scenario to explain the observed properties of GRB 080710. We take into account a top-hat jet and the Gaussian jet models and perform Bayesian parameter estimation using the Markov chain Monte Carlo method to explore the best-describing models in each case.  As a result, we found that both models can be globally consistent with the observation, and it is interesting that both models need isotropic kinetic energy as large as GRB 221009A.