INTEGRAL CONSTRAINTS ON GAMMA-RAY BURST POLARIZATION AND ON THE POPULATION OF NEARBY, LOW-LUMINOSITY BURSTS
| Autor: | A. J. Dean, Sinéad McGlynn, G. Melady, D. R. Willis, Suzanne Foley, A. J. Bird, D. J. Clark, B. McBreen, J. French, Sheila McBreen, Lorraine Hanlon |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
education.field_of_study Spacecraft business.industry Astrophysics::High Energy Astrophysical Phenomena Population Detector Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Polarization (waves) Azimuth Space and Planetary Science business education Gamma-ray burst Mathematical Physics |
| Zdroj: | International Journal of Modern Physics D. 17:1351-1357 |
| ISSN: | 1793-6594 0218-2718 |
| Popis: | The ESA γ-ray astronomy satellite INTEGRAL localized 46 gamma-ray bursts between October 2002 and July 2007. Spectral lags have been determined from the burst time profiles for about half the sample, despite the extreme faintness of many INTEGRAL bursts. INTEGRAL's sensitivity across the energy range of interest for the prompt burst emission allows us to investigate the hypothesis of a low-luminosity, nearby population of bursts. The azimuthal distribution of double-scatter events in SPI's germanium detectors, in conjunction with a sophisticated spacecraft and instrument mass model, have been used to place limits on the percentage of polarization in the prompt emission of the brightest INTEGRAL burst, GRB 041219a. |
| Databáze: | OpenAIRE |
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