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The Swift/Fermi GRB 080928 from 1 eV to 150 keV

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dc.contributor.author Rossi, A.
dc.contributor.author Pandey, S. B.
dc.date.accessioned 2013-05-21T11:25:54Z
dc.date.available 2013-05-21T11:25:54Z
dc.date.issued 2011
dc.identifier.uri http://hdl.handle.net/123456789/929
dc.description.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 had already been detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 s 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. In particular, we show that the SED during the main prompt emission phase agrees with synchrotron radiation. We constructed the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia), and GROND (La Silla) data and compared 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, weinvestigate whether the temporal and spectral evolution of the tail emission of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission (LAE). We find that a nonstandard LAE model is required to explain the observations. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided. en_US
dc.language.iso en_US en_US
dc.publisher EDP en_US
dc.relation.ispartofseries aa529-A412
dc.subject gamma-ray burst: individual: GRB 080928 en_US
dc.title The Swift/Fermi GRB 080928 from 1 eV to 150 keV en_US
dc.type Article en_US


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