Polarimetric Analysis of the Long Duration Gamma-Ray Burst GRB 160530A With the Balloon Borne Compton Spectrometer and Imager

被引：24

作者：

Lowell, A. W. ^{[1
]}

Boggs, S. E. ^{[1
]}

Chiu, C. L. ^{[1
]}

Kierans, C. A. ^{[1
]}

Sleator, C. ^{[1
]}

Tomsick, J. A. ^{[1
]}

Zoglauer, A. C. ^{[1
]}

Chang, H. -K. ^{[2
]}

Tseng, C. -H. ^{[2
]}

Yang, C. -Y. ^{[2
]}

Jean, P. ^{[3
]}

von Ballmoos, P. ^{[3
]}

Lin, C. -H. ^{[4
]}

Amman, M. ^{[5
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] Natl Tsing Hua Univ, Inst Astron, Hsinchu, Taiwan

[3] IRAP Toulouse, Toulouse, France

[4] Acad Sinica, Inst Phys, Taipei, Taiwan

[5] Lawrence Berkeley Natl Lab, Berkeley, CA USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 848卷 / 02期

关键词：

balloons; gamma-ray burst: individual (GRB 160530A); gamma rays: general; instrumentation: polarimeters; polarization; techniques: polarimetric; POLARIZATION; ASTRONOMY;

D O I：

10.3847/1538-4357/aa8ccb

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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).

引用

页数：10

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