The Suzaku-Swift joint observation of the early X-ray afterglow of GRB060105

Makoto S. Tashiro, Keiichi Abe, Lorella Angelini, Scott Barthelmy, Neil Gehrels, Nobuyuki Ishikawa, Louis J. Kaluzienski, Nobuyuki Kawai, Richard L. Kelley, Kenzo Kinugasa, Hironobu Kodaira, Takayoshi Kohmura, Kaori Kubota, Yoshitomo Maeda, Shouta Maeno, Hiroshi Murakami, Toshio Murakami, Yujin E. Nakagawa, Kazuhiro Nakazawa, John NousekShin'ya Okuno, Kaori Onda, James N. Reeves, George Ricker, Goro Sato, Eri Sonoda, Motoko Suzuki, Tadayuki Takahashi, Toru Tamagawa, Ke N.Ichi Torii, Yoshihiro Ueda, Yuji Urata, Kazutaka Yamaoka, Makoto Yamauchi, Daisuke Yonetoku, Atsumasa Yoshida, Satoru Yoshinari

Research output: Contribution to journalArticlepeer-review

Abstract

Results are presented of a Suzaku and Swift joint observation for an early X-ray afterglow of GRB 060105. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope (BAT) at 06:49:28 on 5 January 2006 (T0). The Suzaku team commenced a pre-planned target of opportunity observation at 12:10 and continued till 12:00 on January 6. The X-ray flux faded during the observations from 6.8 × 10-9 erg s _1cm-2 to 1.5 × 10-13 erg s _1cm-2 in the 2-10 keV energy band. Following the prompt emission and successive "very steep decay", a "shallow decay" was observed from T0 + 187 s to T0 + 1287 s. After an observation gap during T0 + (1.5 - 3) ks, an extremely early steep decay was observed in T0 + (4-30) ks. The steep decay exhibited decay indices of 2.3 - 2.4. This very early break, if it is a jet break, is the earliest case among X-ray afterglow observations, suggesting a very narrow jet whose opening angle is well below 1°.

Original languageEnglish (US)
Pages (from-to)3-6
Number of pages4
JournalProgress of Theoretical Physics Supplement
Issue number169
DOIs
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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