Transient Optical Emission from a Nonstationary Accretion Disk: A Model for Optical Afterglow of Gamma Ray Bursts

The main goal of the MASTER-Net project is to produce a unique fast sky survey with all sky observed over a single night down to a limiting magnitude of 19-20. Such a survey will make it possible to address a number of fundamental problems: search for dark energy via the discovery and photometry of supernovae (including SNIa), search for exoplanets, microlensing effects, discovery of minor bodies in the Solar System, and space-junk monitoring. All MASTER telescopes can be guided by alerts, and we plan to observe prompt optical emission from gamma-ray bursts synchronously in several filters and in several polarization planes.

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Exceptionally bright optical emission from a rare and distant gamma-ray burst

10.21203/rs.3.rs-1101440/v1 ◽

2021 ◽

Author(s):

Gor Oganesyan ◽

Sergey Karpov ◽

Martin Jelinek ◽

Gregory Beskin ◽

Samuele Ronchini ◽

...

Keyword(s):

Gamma Ray ◽

Massive Stars ◽

Optical Emission ◽

Gamma Ray Bursts ◽

Additional Component ◽

Relativistic Jets ◽

X Ray ◽

Forward Shock ◽

Multi Wavelength ◽

Wavelength Emission

Abstract Long gamma-ray bursts (GRBs) are produced by the dissipation of ultra-relativistic jets launched by newly-born black holes after the collapse of massive stars. Right after the luminous and highly variable gamma-ray emission, the multi-wavelength afterglow is released by the external dissipation of the jet in circumburst medium. We report the discovery of a very bright (10 mag) optical emission 28 s after the explosion of the extremely luminous and energetic GRB 210619B located at redshift 1.937. Early multi-filter observations allowed us to witness the end of the shock wave propagation into the GRB ejecta. We observed the spectral transition from a bright reverse to the forward shock emission, demonstrating that the early and late GRB multi-wavelength emission is originated from a very narrow jet propagating into an unusually rarefied interstellar medium. We also find evidence of an additional component of radiation, coming from the jet wings which is able explain the uncorrelated optical/X-ray emission.

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GAMMA-RAY BURSTS — OBSERVATIONS

International Journal of Modern Physics D ◽

10.1142/s021827181001710x ◽

2010 ◽

Vol 19 (06) ◽

pp. 977-984

Author(s):

N. GEHRELS ◽

J. K. CANNIZZO

Keyword(s):

Gamma Ray ◽

Optical Emission ◽

High Energy ◽

Gamma Ray Bursts ◽

Medium Energy ◽

Host Galaxies ◽

Data Set ◽

Spectral Signatures ◽

High Energy Emission ◽

Combined Data

We are in an exciting period of discovery for gamma-ray bursts. The Swift observatory is detecting 100 bursts per year, providing arcsecond localizations and sensitive observations of the prompt and afterglow emission. The Fermi observatory is observing 250 bursts per year with its medium-energy GRB instrument and about 10 bursts per year with its high-energy LAT instrument. In addition, rapid-response telescopes on the ground are providing new capabilities to study optical emission during the prompt phase and spectral signatures of the host galaxies. The combined data set is enabling great advances in our understanding of GRBs including afterglow physics, short burst origin, and high-energy emission.

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