1. Suzaku and Swift observations for X-ray afterglows; Investigation into the electron acceleration in the internal∕external shocks
- Author
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N. Kawai, N. Gehrels, Suzaku Grb ToO Team, T. Ishimura, H. Kodaira, Toru Tamagawa, T. Shimokawabe, J. A. Nousek, E. Sonoda, S. Maeno, K. Abe, Sachiko Tanabe, Y. Ueda, Daisuke Yonetoku, M. Suzuki, Yujin E. Nakagawa, Yoshiki Kodama, K. Yamaoka, S. Sugita, Makoto Yamauchi, Naomi Emura, K. Sugiyasu, K. Onda, Takayoshi Kohmura, Takuro Nashimoto, Yuka Aoyama, Y. Urata, M. Kuwahara, S. Okuno, K. Masui, M. Tashiro, A. Yoshida, K. Nakazawa, Takuya Takahashi, Toshio Murakami, D. Matsuura, Satoru Yoshinari, K. Kubota, R. Kozaka, S. Yokota, K. Kinugasa, and T. Kidamura
- Subjects
Shock wave ,Swift ,Physics ,Photon ,Astrophysics::High Energy Astrophysical Phenomena ,X-ray ,Phase (waves) ,Astronomy ,Astrophysics ,Spectral line ,Afterglow ,Gamma-ray burst ,computer ,computer.programming_language - Abstract
We have performed ToO observations for three bright GRBs with the Japanese X‐ray satellite “Suzaku”. Suzaku strongly supports the follow‐up observations by Swift, especially in the late time afterglow phase, with its capabilities of larger effective area and wider energy band compared with Swift/XRT. In this presentation, mainly focusing on the X‐ray afterglow of GRB 060904A, we introduce these ToO observation results. In GRB 060904A, we found rapid spectral softening with the photon indices from 1.5 to 5.3 during the steep decay (prompt tail) phase in the BAT and XRT data. This ultra soft spectra suddenly disappeared at the transition time from the prompt tail phase to the shallow decay one. After that, typical afterglow spectra with the photon indices of 2.0 are continuously and preciously monitored by both XRT and Suzaku/XIS up to 1 day since the burst trigger time. To explain this ultra soft spectra, we introduce a spectral cutoff model instead of power‐law, and investigate the possibility of the maxi...
- Published
- 2008
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