The origin of the optical flashes: The case study of GRB 080319B and GRB 130427A

Abstract

Correlations between optical flashes and gamma-ray emissions in gamma-ray bursts have been searched in order to clarify the question whether these emissions occur at internal and/or external shocks. Among the most powerful gamma-ray bursts ever recorded are GRB 080319B and GRB 130427A which at early phase presented bright optical flashes possible correlated with $\gamma$-ray components. Additionally, both bursts were fortuitously located within the field of view of the TeV $\gamma$-ray Milagro and HAWC observatories, and although no statistically significant excess of counts were collected, upper limits were placed on the GeV - TeV emission. Considering the synchrotron self-Compton emission from internal shocks and requiring the GeV-TeV upper limits we found that the optical flashes and the $\gamma$-ray components are produced by different electron populations. Analyzing the optical flashes together the multiwavelength afterglow observation, we found that these flashes can be interpreted in the framework of the synchrotron reverse-shock model when outflows have arbitrary magnetizations.

9 pages, 5 figures and 4 tables. Accepted for publication in ApJ

References in corpus (19)

• The Supernova -- Gamma-Ray Burst Connection
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. I. Spectral Components and Their Possible Physical Origins of LAT/GBM GRBs
• Observations of the Naked-Eye GRB 080319B: Implications of Nature's Brightest Explosion
• On the Mechanism of Gamma-Ray Burst Afterglows
• Can the early X-ray afterglow of GRBs be explained by a contribution from the reverse shock?
• A general scheme for modeling gamma-ray burst prompt emission
• Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow
• The very early afterglow powered by the ultra-relativistic mildly magnetized outflows
• Prompt Emission of High Energy Photons from Gamma Ray Bursts
• Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons, Muons and Electron-Positron Pairs
• Observational Limits on Inverse Compton Processes in GRBs
• Theoretical Description Of GRB 160625B with Wind-to-ISM Transition and Implications for a Magnetized Outflow
• The Dark Side of ROTSE-III Prompt GRB Observations
• GRB 110731A: Early afterglow in stellar wind powered by a magnetized outflow
• Modeling the early afterglow in the short and hard GRB 090510
• Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations
• GeV Emission from Prompt and Afterglow Phases of Gamma-Ray Bursts
• Clues from the prompt emission of GRB 080319B

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