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Beskin G.,Russian Academy of Sciences | Karpov S.,Russian Academy of Sciences | Bondar S.,Institute for Precise Instrumentation | Guarnieri A.,University of Bologna | And 3 more authors.
Astrophysical Bulletin | Year: 2010

The results of observations of the optical emission that accompanied the gamma-ray burst GRB 080319B are reported. Observations were made using the TORTORA fast wide-field camera mounted on the REM robotic telescope in Chile. The behavior of the light curve before, during, and after the gamma-ray burst is described. The light curve consists of four, possibly periodic, 5-7 s long peaks 8-9 s apart. The behavior of the burst in the gamma and optical energy ranges are compared and the results of the theoretical interpretation of this comparison are reported. © 2010 Pleiades Publishing, Ltd. Source


Beskin G.,Special Astropysical Observatory | Karpov S.,Special Astropysical Observatory | Bondar S.,Institute for Precise Instrumentation | Guarnieri A.,University of Bologna | And 3 more authors.
AIP Conference Proceedings | Year: 2010

Naked-Eye Burst is the only event to date observed in optical and gamma-ray ranges simultaneously with sufficiently high temporal resolution. This opens unprecedented possibilities for testing various models of both emission generation and the central engine behaviour during the burst. The temporal properties of the observed light curve, along with tight optical to gamma relation, suggest the intrinsic periodicity of internal engine, which is supposedly a newborn stellar-mass black hole surrounded by an unstable precessing massive accretion disk. © 2010 American Institute of Physics. Source


Beskin G.,Special Astropysical Observatory | Bondar S.,Institute for Precise Instrumentation | Karpov S.,Special Astropysical Observatory | Guarnieri A.,University of Bologna | And 3 more authors.
AIP Conference Proceedings | Year: 2010

We discuss the strategy of search for fast optical transients accompanying gamma-ray bursts by means of continuous monitoring of wide sky fields with high temporal resolution. We describe the design, performance and results of our cameras, FAVOR and TORTORA. Also we discuss the perspectives of this strategy and possible design of next-generation equipment for wide-field monitoring which will be able to detect optical transients and to study their color and polarization properties with high time resolution. © 2010 American Institute of Physics. Source


Beskin G.,Special Astrophysical Observatory | Karpov S.,Special Astrophysical Observatory | Bondar S.,Institute for Precise Instrumentation | Greco G.,National institute for astrophysics | And 3 more authors.
Astrophysical Journal Letters | Year: 2010

We imaged the position of the naked-eye burst, GRB080319B, before, during, and after its gamma-ray activity with sub-second temporal resolution using the TORTORA wide-field camera. The burst optical prompt emission, which reached 5.3 mag, has been detected, and its periodic optical variability has been discovered in the form of four equidistant flashes with a duration of several seconds. We also detected a strong correlation (r ≈ 0.82) between optical and gamma-ray light curves with a 2 s delay of the optical emission with respect to the gamma-ray emission. The revealed temporal structure of the optical light curve in comparison with the gamma-ray light curve can be interpreted in the framework of themodel of shell collisions in the ejecta containing a significant neutron component. All observed emission features reflect the non-stationary behavior of the burst internal engine - supposedly, a hyperaccreting solar-mass black hole formed in the collapse of a massive stellar core. © 2010. The American Astronomical Society. All rights reserved. Source


Karpov S.,Russian Academy of Sciences | Beskin G.,Russian Academy of Sciences | Bondar S.,Institute for Precise Instrumentation | Guarnieri A.,University of Bologna | And 3 more authors.
Advances in Astronomy | Year: 2010

In order to detect and investigate short stochastic optical flares from a number of variable astrophysical objects (GRBs, SNe, flare stars, CVs, X-Ray binaries) of unknown localizations as well as near-earth objects (NEOs), both natural and artificial, it is necessary to perform the systematic monitoring of large regions of the sky with high temporal resolution. Here we discuss the criteria for a system that is able to perform such a task and describe two cameras we created for wide-field monitoring with high temporal resolution-FAVOR and TORTORA. Also, we describe basic principles of real-time data processing for the high frame rates needed to achieve subsecond temporal resolution on a typical hardware. Copyright © 2010 Sergey Karpov et al. Source

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