Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts

Takanori Sakamoto; Valentin Pal'Shin; Kazutaka Yamaoka; Masanori Ohno; Goro Sato; Rafail Aptekar; Scott D. Barthelmy; Wayne H. Baumgartner; Jay R. Cummings; Edward E. Fenimore; Dmitry Frederiks; Neil Gehrels; Sergey Golenetskii; Hans A. Krimm; Craig B. Markwardt; Kaori Onda; David M. Palmer; Ann M. Parsons; Michael Stamatikos; Satoshi Sugita; Makoto Tashiro; Jack Tueller; Tilan N. Ukwatta

Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts

Takanori Sakamoto^*, Valentin Pal'Shin, Kazutaka Yamaoka, Masanori Ohno, Goro Sato, Rafail Aptekar, Scott D. Barthelmy, Wayne H. Baumgartner, Jay R. Cummings, Edward E. Fenimore, Dmitry Frederiks, Neil Gehrels, Sergey Golenetskii, Hans A. Krimm, Craig B. Markwardt, Kaori Onda, David M. Palmer, Ann M. Parsons, Michael Stamatikos, Satoshi SugitaMakoto Tashiro, Jack Tueller, Tilan N. Ukwatta

^*Corresponding author for this work

Waseda Research Institute for Science and Engineering

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to use simultaneously observed GRBs as a spectral calibration source to understand systematic problems among the instruments. Based on these joint spectral fits, we find that (1) although a constant factor (a normalization factor) agrees within 20% among the instruments, the BAT constant factor shows a systematically smaller value by 10%-20% compared to that of Konus-Wind, (2) there is a systematic trend that the low-energy photon index becomes steeper by 0.1-0.2 and E_peak becomes systematically higher by 10%-20% when including the BAT data in the joint fits, and (3) the high-energy photon index agrees within 0.2 among the instruments. Our results show that cross-calibration based on joint spectral analysis is an important step to understanding the instrumental effects that could be affecting the scientific results from the GRB prompt emission data.

Original language	English
Pages (from-to)	215-277
Number of pages	63
Journal	Publications of the Astronomical Society of Japan
Volume	63
Issue number	1
Publication status	Published - 2011 Feb 25

Keywords

Burst -gamma rays
Detectors
Gamma rays
Observations-instrumentation

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Cite this

Sakamoto, T., Pal'Shin, V., Yamaoka, K., Ohno, M., Sato, G., Aptekar, R., Barthelmy, S. D., Baumgartner, W. H., Cummings, J. R., Fenimore, E. E., Frederiks, D., Gehrels, N., Golenetskii, S., Krimm, H. A., Markwardt, C. B., Onda, K., Palmer, D. M., Parsons, A. M., Stamatikos, M., ... Ukwatta, T. N. (2011). Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts. Publications of the Astronomical Society of Japan, 63(1), 215-277.

Sakamoto, T, Pal'Shin, V, Yamaoka, K, Ohno, M, Sato, G, Aptekar, R, Barthelmy, SD, Baumgartner, WH, Cummings, JR, Fenimore, EE, Frederiks, D, Gehrels, N, Golenetskii, S, Krimm, HA, Markwardt, CB, Onda, K, Palmer, DM, Parsons, AM, Stamatikos, M, Sugita, S, Tashiro, M, Tueller, J & Ukwatta, TN 2011, 'Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts', Publications of the Astronomical Society of Japan, vol. 63, no. 1, pp. 215-277.

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abstract = "We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to use simultaneously observed GRBs as a spectral calibration source to understand systematic problems among the instruments. Based on these joint spectral fits, we find that (1) although a constant factor (a normalization factor) agrees within 20% among the instruments, the BAT constant factor shows a systematically smaller value by 10%-20% compared to that of Konus-Wind, (2) there is a systematic trend that the low-energy photon index becomes steeper by 0.1-0.2 and Epeak becomes systematically higher by 10%-20% when including the BAT data in the joint fits, and (3) the high-energy photon index agrees within 0.2 among the instruments. Our results show that cross-calibration based on joint spectral analysis is an important step to understanding the instrumental effects that could be affecting the scientific results from the GRB prompt emission data.",

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AU - Sakamoto, Takanori

AU - Pal'Shin, Valentin

AU - Yamaoka, Kazutaka

AU - Ohno, Masanori

AU - Sato, Goro

AU - Aptekar, Rafail

AU - Barthelmy, Scott D.

AU - Baumgartner, Wayne H.

AU - Cummings, Jay R.

AU - Fenimore, Edward E.

AU - Frederiks, Dmitry

AU - Gehrels, Neil

AU - Golenetskii, Sergey

AU - Krimm, Hans A.

AU - Markwardt, Craig B.

AU - Onda, Kaori

AU - Palmer, David M.

AU - Parsons, Ann M.

AU - Stamatikos, Michael

AU - Sugita, Satoshi

AU - Tashiro, Makoto

AU - Tueller, Jack

AU - Ukwatta, Tilan N.

PY - 2011/2/25

Y1 - 2011/2/25

N2 - We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to use simultaneously observed GRBs as a spectral calibration source to understand systematic problems among the instruments. Based on these joint spectral fits, we find that (1) although a constant factor (a normalization factor) agrees within 20% among the instruments, the BAT constant factor shows a systematically smaller value by 10%-20% compared to that of Konus-Wind, (2) there is a systematic trend that the low-energy photon index becomes steeper by 0.1-0.2 and Epeak becomes systematically higher by 10%-20% when including the BAT data in the joint fits, and (3) the high-energy photon index agrees within 0.2 among the instruments. Our results show that cross-calibration based on joint spectral analysis is an important step to understanding the instrumental effects that could be affecting the scientific results from the GRB prompt emission data.

AB - We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to use simultaneously observed GRBs as a spectral calibration source to understand systematic problems among the instruments. Based on these joint spectral fits, we find that (1) although a constant factor (a normalization factor) agrees within 20% among the instruments, the BAT constant factor shows a systematically smaller value by 10%-20% compared to that of Konus-Wind, (2) there is a systematic trend that the low-energy photon index becomes steeper by 0.1-0.2 and Epeak becomes systematically higher by 10%-20% when including the BAT data in the joint fits, and (3) the high-energy photon index agrees within 0.2 among the instruments. Our results show that cross-calibration based on joint spectral analysis is an important step to understanding the instrumental effects that could be affecting the scientific results from the GRB prompt emission data.

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KW - Gamma rays

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Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts

Abstract

Keywords

ASJC Scopus subject areas

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