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Sakamoto, Takanori; Pal'SHIN, Valentin; Yamaoka, Kazutaka; Ohno, Masanori; Sato, Goro; Aptekar, Rafail; Barthelmy, Scott D; Baumgartner, Wayne H; Cummings, Jay R; Fenimore, Edward E; Frederiks, Dmitry; Gehrels, Neil; Golenetskii, Sergey; Krimm, Hans A; Markwardt, Craig B; Onda, Kaori; Palmer, David M; Parsons, Ann M; Stamatikos, Michael; Sugita, Satoshi; Tashiro, Makoto; Tueller, Jack; Ukwatta, Tilan N
Publications of the Astronomical Society of Japan, 02/2011, Volume: 63, Issue: 1Journal Article
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 $E_{\rm peak}$ 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.
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