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19 April 2024

» arxiv » 1007.0383

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The Swift/Fermi GRB 080928 from 1 eV to 150 keV
A. Rossi ; S. Schulze ; S. Klose ; D. A. Kann ; A. Rau ; H. A. Krimm ; G. Jóhannesson ; A. Panaitescu ; F. Yuan ; P. Ferrero ; T. Krühler ; J. Greiner ; P. Schady ; S. B. Pandey ; L. Amati ; P. M. J. Afonso ; C. W. Akerlof ; L. Arnold ; C. Clemens ; R. Filgas ; D. H. Hartmann ; A. Küpcü Yoldaş ; S. McBreen ; T. A. McKay ; A. Nicuesa Guelbenzu ; F. Olivares E. ; B. Paciesas ; E. S. Rykoff ; G. Szokoly ; A. C. Updike ; A. Yoldaş ;
Date:	2 Jul 2010
Abstract:	We present the results of a comprehensive study of the Gamma-Ray Burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission was already detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 seconds simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. Here we analyze the prompt emission, constrain its spectral properties, and set lower limits on the initial Lorentz factor of the relativistic outflow. In particular, we show that the SED during the main prompt emission phase is in agreement with synchrotron radiation. We construct the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia) and GROND (La Silla) data and compare it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape can be modeled by multiple energy injections into the forward shock. Furthermore, we provide evidence that the temporal and spectral evolution of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided.
Source:	arXiv, 1007.0383
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