Swift and Suzaku observations of the X-ray afterglow from the GRB 060105

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 Nousek; Shin'ya Okuno; Kaori Onda; James N. Reeves; George Ricker; Goro Sato; Eri Sonoda; Motoko Suzuki; Tadayuki Takahashi; Toni Tamagawa; Ken'ichi Torii; Yoshihiro Ueda; Yuji Urata; Kazutaka Yamaoka; Makoto Yamauchi; Daisuke Yonetoku; Atsumasa Yoshida; Satoru Yoshinari

doi:10.1093/pasj/59.sp1.s361

Swift and Suzaku observations of the X-ray afterglow from the GRB 060105

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, Toni Tamagawa, Ken'ichi Torii, Yoshihiro Ueda, Yuji Urata, Kazutaka Yamaoka, Makoto Yamauchi, Daisuke Yonetoku, Atsumasa Yoshida, Satoru Yoshinari

Astronomy & Astrophysics

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Abstract

Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope at 06:49:28 on 2006 January 5 (T₀). The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. The X-ray flux faded during observations from 6.8 × 10^-9 erg s^-1 cm^-2 (at T₀ + 87 s with the Swift/XRT) to 1.5 × 10^-13 erg s^-1 cm^-2 [at T₀ + 94-101 ks with the Suzaku X-ray Imaging Spectrometer (XIS)] in the 2-10 keV energy band. Following 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 lightcurve flattened again at T₀ + 30ks, and another steep decay followed from T₀ + 50ks to the end of observations. Both steep decays 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°. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z = 4.0 ± 1.3 the upper limit on the iron line equivalent width is 50 eV.

Original language	English (US)
Pages (from-to)	S361-S367
Journal	Publications of the Astronomical Society of Japan
Volume	59
Issue number	1 SPEC. ISS.
DOIs	https://doi.org/10.1093/pasj/59.sp1.s361
State	Published - 2007

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/pasj/59.sp1.s361

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Tashiro, M. S., Abe, K., Angelini, L., Barthelmy, S., Gehrels, N., Ishikawa, N., Kaluzienski, L. J., Kawai, N., Kelley, R. L., Kinugasa, K., Kodaira, H., Kohmura, T., Kubota, K., Maeda, Y., Maeno, S., Murakami, H., Murakami, T., Nakagawa, Y. E., Nakazawa, K., ... Yoshinari, S. (2007). Swift and Suzaku observations of the X-ray afterglow from the GRB 060105. Publications of the Astronomical Society of Japan, 59(1 SPEC. ISS.), S361-S367. https://doi.org/10.1093/pasj/59.sp1.s361

@article{a57d2d1b6b38454dac76e9545205521d,

title = "Swift and Suzaku observations of the X-ray afterglow from the GRB 060105",

abstract = "Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope at 06:49:28 on 2006 January 5 (T0). The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. The X-ray flux faded during observations from 6.8 × 10-9 erg s-1 cm-2 (at T0 + 87 s with the Swift/XRT) to 1.5 × 10-13 erg s-1 cm-2 [at T0 + 94-101 ks with the Suzaku X-ray Imaging Spectrometer (XIS)] in the 2-10 keV energy band. Following 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 lightcurve flattened again at T0 + 30ks, and another steep decay followed from T0 + 50ks to the end of observations. Both steep decays 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°. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z = 4.0 ± 1.3 the upper limit on the iron line equivalent width is 50 eV.",

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

year = "2007",

doi = "10.1093/pasj/59.sp1.s361",

language = "English (US)",

volume = "59",

pages = "S361--S367",

journal = "Publications of the Astronomical Society of Japan",

issn = "0004-6264",

publisher = "Oxford University Press",

number = "1 SPEC. ISS.",

}

Tashiro, MS, Abe, K, Angelini, L, Barthelmy, S, Gehrels, N, Ishikawa, N, Kaluzienski, LJ, Kawai, N, Kelley, RL, Kinugasa, K, Kodaira, H, Kohmura, T, Kubota, K, Maeda, Y, Maeno, S, Murakami, H, Murakami, T, Nakagawa, YE, Nakazawa, K, Nousek, J, Okuno, S, Onda, K, Reeves, JN, Ricker, G, Sato, G, Sonoda, E, Suzuki, M, Takahashi, T, Tamagawa, T, Torii, K, Ueda, Y, Urata, Y, Yamaoka, K, Yamauchi, M, Yonetoku, D, Yoshida, A & Yoshinari, S 2007, 'Swift and Suzaku observations of the X-ray afterglow from the GRB 060105', Publications of the Astronomical Society of Japan, vol. 59, no. 1 SPEC. ISS., pp. S361-S367. https://doi.org/10.1093/pasj/59.sp1.s361

TY - JOUR

T1 - Swift and Suzaku observations of the X-ray afterglow from the GRB 060105

AU - Tashiro, Makoto S.

AU - Abe, Keiichi

AU - Angelini, Lorella

AU - Barthelmy, Scott

AU - Gehrels, Neil

AU - Ishikawa, Nobuyuki

AU - Kaluzienski, Louis J.

AU - Kawai, Nobuyuki

AU - Kelley, Richard L.

AU - Kinugasa, Kenzo

AU - Kodaira, Hironobu

AU - Kohmura, Takayoshi

AU - Kubota, Kaori

AU - Maeda, Yoshitomo

AU - Maeno, Shouta

AU - Murakami, Hiroshi

AU - Murakami, Toshio

AU - Nakagawa, Yujin E.

AU - Nakazawa, Kazuhiro

AU - Nousek, John

AU - Okuno, Shin'ya

AU - Onda, Kaori

AU - Reeves, James N.

AU - Ricker, George

AU - Sato, Goro

AU - Sonoda, Eri

AU - Suzuki, Motoko

AU - Takahashi, Tadayuki

AU - Tamagawa, Toni

AU - Torii, Ken'ichi

AU - Ueda, Yoshihiro

AU - Urata, Yuji

AU - Yamaoka, Kazutaka

AU - Yamauchi, Makoto

AU - Yonetoku, Daisuke

AU - Yoshida, Atsumasa

AU - Yoshinari, Satoru

PY - 2007

Y1 - 2007

N2 - Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope at 06:49:28 on 2006 January 5 (T0). The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. The X-ray flux faded during observations from 6.8 × 10-9 erg s-1 cm-2 (at T0 + 87 s with the Swift/XRT) to 1.5 × 10-13 erg s-1 cm-2 [at T0 + 94-101 ks with the Suzaku X-ray Imaging Spectrometer (XIS)] in the 2-10 keV energy band. Following 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 lightcurve flattened again at T0 + 30ks, and another steep decay followed from T0 + 50ks to the end of observations. Both steep decays 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°. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z = 4.0 ± 1.3 the upper limit on the iron line equivalent width is 50 eV.

AB - Results are presented of early X-ray afterglow observations of GRB 060105 by Swift and Suzaku. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope at 06:49:28 on 2006 January 5 (T0). The Suzaku team commenced a pre-planned target of opportunity observation at 19 ks (5.3 hr) after the Swift trigger. The X-ray flux faded during observations from 6.8 × 10-9 erg s-1 cm-2 (at T0 + 87 s with the Swift/XRT) to 1.5 × 10-13 erg s-1 cm-2 [at T0 + 94-101 ks with the Suzaku X-ray Imaging Spectrometer (XIS)] in the 2-10 keV energy band. Following 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 lightcurve flattened again at T0 + 30ks, and another steep decay followed from T0 + 50ks to the end of observations. Both steep decays 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°. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z = 4.0 ± 1.3 the upper limit on the iron line equivalent width is 50 eV.

UR - http://www.scopus.com/inward/record.url?scp=34047132162&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34047132162&partnerID=8YFLogxK

U2 - 10.1093/pasj/59.sp1.s361

DO - 10.1093/pasj/59.sp1.s361

M3 - Article

AN - SCOPUS:34047132162

SN - 0004-6264

VL - 59

SP - S361-S367

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 1 SPEC. ISS.

ER -

Swift and Suzaku observations of the X-ray afterglow from the GRB 060105

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