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

Research output: Contribution to journalArticle

22 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 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.

Original languageEnglish
Pages (from-to)215-277
Number of pages63
JournalPublications of the Astronomical Society of Japan
Volume63
Issue number1
Publication statusPublished - 2011 Feb 25

Keywords

  • Burst -gamma rays
  • Detectors
  • Gamma rays
  • Observations-instrumentation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Spectral cross-calibration of the konus-wind, the suzaku/WAM, and the swift/BAT data using gamma-ray bursts'. Together they form a unique fingerprint.

  • 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.