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

*Corresponding author for this work

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

ASJC Scopus subject areas

  • General Physics and Astronomy


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