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The Swift/Fermi GRB 080928 from 1 eV to 150 keVWe present the results of a comprehensive study of the Gamma-Ray Burst 080928 and of its afterglow. GRB 08092 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-Illa (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.
Document ID
20100031229
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Sonbas, Eda
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rossi, A.
(Thueringer Landessternwarte Tautenburg, Germany)
Schulze, S.
(Thueringer Landessternwarte Tautenburg, Germany)
Klose, S.
(Thueringer Landessternwarte Tautenburg, Germany)
Kann, D. A.
(Thueringer Landessternwarte Tautenburg, Germany)
Ferrero, P.
(Thueringer Landessternwarte Tautenburg, Germany)
NicuesaGuelbenzu, A.
(Thueringer Landessternwarte Tautenburg, Germany)
Rau, A.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Kruehler, T.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Greiner, J.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Schady, P.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Afonso, P. M. J.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Clemens, C.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Filgas, R.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
KuepcuYoldas, A.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
McBreen, S.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Olivares, F.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Szokoly, G.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Yoldas, A.
(Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Krimm, H. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Johannesson, G.
(Stanford Univ. Stanford, CA, United States)
Panaitescu, A.
(Los Alamos National Lab. NM, United States)
Yuan, F.
(Michigan Univ. Ann Arbor, MI, United States)
Pandey, S. B.
(Michigan Univ. Ann Arbor, MI, United States)
Akerlof, C. W.
(Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
August 25, 2013
Publication Date
July 7, 2010
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NNG06E090A
CONTRACT_GRANT: DFG KI 766/11-3
CONTRACT_GRANT: DFG KI 766/16-1
Distribution Limits
Public
Copyright
Other

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