Suzaku observation of X-ray afterglow: Spectral and temporal behaviors

D. Yonetoku, T. Murakami, H. Kodaira, S. Okuno, S. Yoshinari, K. Abe, L. Angelini, S. Barthelmy, N. Gehrels, N. Ishikawa, L. J. Kaluzienski, N. Kawai, R. L. Kelley, K. Kinugasa, T. Kohmura, K. Kubota, Y. Maeda, S. Maeno, H. Murakami, Y. E. NakagawaK. Nakazawa, J. Nousek, K. Onda, J. N. Reeves, G. Ricker, G. Sato, E. Sonoda, M. Suzuki, T. Takahashi, T. Tamagawa, M. S. Tashiro, K. Torii, Y. Ueda, Y. Urata, K. Yamaoka, M. Yamauchi, A. Yoshida

Research output: Contribution to journalArticlepeer-review


We report about early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The Suzaku team commenced a pre-planned target of opportunity observation at 5.3 h after the Swift trigger. Following the prompt emission and successive very steep decay, a shallow decay was observed from T0 + 187 s to T0 + 1287s by Swift. After that, an extremely early steep decay was observed in T0 + (4 30) ks. The light curve flattened again and another steep decay from T0 + 50 ks to the end of Suzaku observations was observed. Both steep decays exhibited almost same decay indices of 2.3-2.4. This break time, if it is caused by a jet break, is the earliest case among X-ray afterglow observations, suggesting a very narrow jet opening angle is about 0.7 degree. The unique Suzaku/XIS data allow us to set very tight upper limits on emission line in this GRB. Using the reported pseudo-redshift of z = 4.0 ± 1.3. we set the upper limit on the equivalent width of iron emission line at a few eV.

Original languageEnglish (US)
Pages (from-to)1253-1256
Number of pages4
JournalNuovo Cimento della Societa Italiana di Fisica B
Issue number10-11
StatePublished - Oct 2006

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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