Abstract We observed an X-ray afterglow of GRB 060904A with the Swift and Suzaku satellites. We found a rapid spectral softening in the prompt tail observed by Swift. Adopting the absorbed power-law model to the observed spectra, the photon indices rapidly change from Γ = 1.2 ± 0.1 to Γ = 5.3 +0.7 −0.6 . It is quite difficult to explain this ultra soft spectrum by the simple electron acceleration and the synchrotron radiation. 1 Then we try to advanced spectral fitting with the broken power-law with exponential cutoff (BPEC) model, and the power-law with blackbody as seen in GRB 060218. The observed spectra can be explained by the both models. After the transition to the shallow decay phase, the spectral photon indices become steady as the ...
We present Swift and XMM observations of GRB 050326, detected by Swift-BAT. The fluence was 7.7x10^-...
Swift captured for the first time a smoothly rising X-ray re-brightening of clear nonflaring origin ...
An early steep decay component following the prompt GRBs is commonly observed in Swift XRT light cur...
[著者版]arXiv:0708.3968v1 [astro-ph] http://arxiv.org/abs/0708.3968We observed an X-ray afterglow of GR...
Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations to b...
Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations to b...
[著者版]Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. ...
We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ra...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
GRB 060614 is a remarkable gamma-ray burst (GRB) observed by Swift with puzzling properties, which c...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Gamma>5 ...
The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this c...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
We report the results of the Swift andXMM-Newtonobservations of the Swift-discoveredGRB060729 (T90 ...
We present Swift and XMM observations of GRB 050326, detected by Swift-BAT. The fluence was 7.7x10^-...
Swift captured for the first time a smoothly rising X-ray re-brightening of clear nonflaring origin ...
An early steep decay component following the prompt GRBs is commonly observed in Swift XRT light cur...
[著者版]arXiv:0708.3968v1 [astro-ph] http://arxiv.org/abs/0708.3968We observed an X-ray afterglow of GR...
Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations to b...
Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations to b...
[著者版]Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. ...
We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ra...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
GRB 060614 is a remarkable gamma-ray burst (GRB) observed by Swift with puzzling properties, which c...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Gamma>5 ...
The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this c...
We present observations of GRB 060124, the first event for which both the prompt and the afterglow e...
We report the results of the Swift andXMM-Newtonobservations of the Swift-discoveredGRB060729 (T90 ...
We present Swift and XMM observations of GRB 050326, detected by Swift-BAT. The fluence was 7.7x10^-...
Swift captured for the first time a smoothly rising X-ray re-brightening of clear nonflaring origin ...
An early steep decay component following the prompt GRBs is commonly observed in Swift XRT light cur...