Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope

T. Sakamoto, G. Sato, L. Barbier, S. D. Barthelmy, J. R. Cummings, E. E. Fenimore, N. Gehrels, D. Hullinger, H. A. Krimm, D. Q. Lamb, C. B. Markwardt, D. M. Palmer, A. M. Parsons, M. Stamatikos, J. Tueller, T. N. Ukwatta

Research output: Contribution to journalArticle

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Abstract

We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correlation is between the Epeak energy, which is the peak energy in the νFν spectrum, and the photon index (Γ) derived from a simple power-law (PL) model. The Epeak- Γ relation, assuming the typical smoothly broken PL spectrum of GRBs, is log Epeak = 3.258-0.829 Γ (1.3 ≤ Γ ≤ 2.3). We take into account not only a range of Epeak energies and fluences, but also distributions for both the low-energy photon index and the high-energy photon index in the smoothly broken PL model. The distribution of burst durations in the BAT GRB sample is also included in the simulation. Our correlation is consistent with the index observed by BAT and Epeak measured by the BAT, and by other GRB instruments. Since about 85% of GRBs observed by the BAT are acceptably fit with the simple PL model because of the relatively narrow energy range of the BAT, this relationship can be used to estimate Epeak when it is located within the BAT energy range.

Original languageEnglish
Pages (from-to)922-935
Number of pages14
JournalAstrophysical Journal
Volume693
Issue number1
DOIs
Publication statusPublished - 2009 Mar 1

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gamma ray bursts
estimators
bursts
telescopes
power law
energy
photons
simulation
fluence
emission spectra
index
estimates

Keywords

  • gamma rays: bursts

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Sakamoto, T., Sato, G., Barbier, L., Barthelmy, S. D., Cummings, J. R., Fenimore, E. E., ... Ukwatta, T. N. (2009). Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope. Astrophysical Journal, 693(1), 922-935. https://doi.org/10.1088/0004-637X/693/1/922

Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope. / Sakamoto, T.; Sato, G.; Barbier, L.; Barthelmy, S. D.; Cummings, J. R.; Fenimore, E. E.; Gehrels, N.; Hullinger, D.; Krimm, H. A.; Lamb, D. Q.; Markwardt, C. B.; Palmer, D. M.; Parsons, A. M.; Stamatikos, M.; Tueller, J.; Ukwatta, T. N.

In: Astrophysical Journal, Vol. 693, No. 1, 01.03.2009, p. 922-935.

Research output: Contribution to journalArticle

Sakamoto, T, Sato, G, Barbier, L, Barthelmy, SD, Cummings, JR, Fenimore, EE, Gehrels, N, Hullinger, D, Krimm, HA, Lamb, DQ, Markwardt, CB, Palmer, DM, Parsons, AM, Stamatikos, M, Tueller, J & Ukwatta, TN 2009, 'Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope', Astrophysical Journal, vol. 693, no. 1, pp. 922-935. https://doi.org/10.1088/0004-637X/693/1/922
Sakamoto T, Sato G, Barbier L, Barthelmy SD, Cummings JR, Fenimore EE et al. Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope. Astrophysical Journal. 2009 Mar 1;693(1):922-935. https://doi.org/10.1088/0004-637X/693/1/922
Sakamoto, T. ; Sato, G. ; Barbier, L. ; Barthelmy, S. D. ; Cummings, J. R. ; Fenimore, E. E. ; Gehrels, N. ; Hullinger, D. ; Krimm, H. A. ; Lamb, D. Q. ; Markwardt, C. B. ; Palmer, D. M. ; Parsons, A. M. ; Stamatikos, M. ; Tueller, J. ; Ukwatta, T. N. / Epeak estimator for gamma-ray bursts observed by the swift burst alert telescope. In: Astrophysical Journal. 2009 ; Vol. 693, No. 1. pp. 922-935.
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AU - Markwardt, C. B.

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AU - Parsons, A. M.

AU - Stamatikos, M.

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N2 - We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correlation is between the Epeak energy, which is the peak energy in the νFν spectrum, and the photon index (Γ) derived from a simple power-law (PL) model. The Epeak- Γ relation, assuming the typical smoothly broken PL spectrum of GRBs, is log Epeak = 3.258-0.829 Γ (1.3 ≤ Γ ≤ 2.3). We take into account not only a range of Epeak energies and fluences, but also distributions for both the low-energy photon index and the high-energy photon index in the smoothly broken PL model. The distribution of burst durations in the BAT GRB sample is also included in the simulation. Our correlation is consistent with the index observed by BAT and Epeak measured by the BAT, and by other GRB instruments. Since about 85% of GRBs observed by the BAT are acceptably fit with the simple PL model because of the relatively narrow energy range of the BAT, this relationship can be used to estimate Epeak when it is located within the BAT energy range.

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