|Author||Lowell, A. W. ♦ Boggs, S. E. ♦ Chiu, C. L. ♦ Kierans, C. A. ♦ Sleator, C. ♦ Tomsick, J. A. ♦ Zoglauer, A. C. ♦ Chang, H. -K. ♦ Tseng, C. -H. ♦ Yang, C. -Y. ♦ Jean, P. ♦ Ballmoos, P. von ♦ Lin, C. -H. ♦ Amman, M.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ COMPTON SPECTROMETERS ♦ COSMIC GAMMA BURSTS ♦ DISTRIBUTION ♦ EMISSION ♦ GAMMA SOURCES ♦ IMAGES ♦ MAXIMUM-LIKELIHOOD FIT ♦ MEV RANGE ♦ POLARIMETERS ♦ POLARIZATION ♦ SCATTERING ♦ TELESCOPES|
|Abstract||A long duration gamma-ray burst, GRB 160530A, was detected by the Compton Spectrometer and Imager (COSI) during the 2016 COSI Super Pressure Balloon campaign. As a Compton telescope, COSI is inherently sensitive to the polarization of gamma-ray sources in the energy range 0.2–5.0 MeV. We measured the polarization of GRB 160530A using (1) a standard method (SM) based on fitting the distribution of azimuthal scattering angles with a modulation curve and (2) an unbinned, maximum likelihood method (MLM). In both cases, the measured polarization level was below the 99% confidence minimum detectable polarization levels of 72.3% ± 0.8% (SM) and 57.5% ± 0.8% (MLM). Therefore, COSI did not detect polarized gamma-ray emission from this burst. Our most constraining 90% confidence upper limit on the polarization level was 46% (MLM).|
|Learning Resource Type||Article|
|Publisher Place||United States|
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