Performance study of the gamma-ray bursts polarimeter POLAR

Sun, Jiulin; Wu, Bobing; Bao, Tianwei; Batsch, T.; Bernasconi, T.; Britvitch, I.; Cadoux, F.; Cernuda, I.; Chai, Jun; Dong, Yongwei; Gauvin, N.; Hajdas, W.; He, J.; Kole, Merlin; Kong, M. N.; Kong, S. W.; Lechanoine‐Leluc, C.; Li, Lü; Liu, J. T.; Liu, X.; Marcinkowski, R.; Orsi, S.; Pohl, M.; Produit, N.; Rapin, D.; Rutczynska, A.; Rybka, D.; Shi, Hongyuan; Song, Liming; Szabelski, J.; Wang, R. J.; Wen, X. Y.; Xiao, H.; Xiong, S. L.; Xu, Hangkun; Xu, Min; Zhang, L.; Zhang, L. Y.; Zhang, S. N.; Zhang, X. F.; Zhang, Y. J.; Zwolinska, A.

doi:10.1117/12.2232133

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Later on, all the compositions of the detector were developed in succession. One of the typical units is the DMU, thus its performance was also studied [12]. Finally, the integration of FM model was done and the calibration with 100% polarized hard X-rays at the European Synchrotron Radiation Facility (ESRF) was performed with lower beam energies of 110 keV, 80 keV and 60 keV for both on-axis and off-axis tests, and the measured modulation factors agreed well with the Monte-Carlo simulation results.…”

Section: Ground Calibration and Performance Studymentioning

confidence: 68%

“…However, all these basic performances of the DMU will finally affect the polarization performance of POLAR, so they are also important to be analyzed. In [12] the basic analysis of DMU concluded that the average intrinsic noise of each DMU is typically below 20 ADC channel which means ∼1 keV; the non-uniformity of the gain for all the DMUs is below 3, typically ∼2 and lowest 1.6; the average low threshold of each DMU is ∼15 keV. The tests were done at module level with a laboratory 22 Na radioactive source with the activity of ∼ 55 kBq.…”

Section: Performance At Module Levelmentioning

confidence: 99%

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Overview of the POLAR mission

Sun¹

2019

Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)

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Section: Ground Calibration and Performance Studymentioning

confidence: 68%

Section: Performance At Module Levelmentioning

confidence: 99%

Overview of the POLAR mission

Sun¹

2019

Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)

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“…One exception is IKAROS/GAP (Yonetoku et al 2011a), a dedicated GRB polarimeter aboard the JAXA solar sail IKAROS which is responsible for the most significant GRB polarization measurements to date (Yonetoku et al 2012). The POLAR instrument aboard the Chinese space station Tiangong 2 is another dedicated GRB polarimeter which was only recently deployed (Sun et al 2016;Orsi et al 2014;Produit et al 2005). POLAR has successfully detected several GRBs in its few months of service (Kole & Marcinkowski 2016;, although no polarization analyses have yet been published.…”

Section: Introductionmentioning

confidence: 99%

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

Lowell

Boggs

Chiu

et al. 2017

ApJ

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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).

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Prompt Emission Polarimetry of Gamma-Ray Bursts with the AstroSat CZT Imager

Chattopadhyay

Vadawale

Aarthy

et al. 2019

ApJ

129

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X-ray and Gamma-ray polarization measurements of the prompt emission of Gamma-ray bursts (GRBs) are believed to be an important tool to test the various models of GRBs. Although there are some reports of hard X-ray polarization measurements of the prompt emission of GRBs, the number of measurements are small to provide statistically significant inputs to the GRB models due to the extreme difficulty of measuring them and quantifying their significance. CZTI onboard AstroSat is primarily an X-ray spectroscopic instrument but works as a wide angle GRB monitor due to the increasing transparency of the CZTI support structure. It also has experimentally verified polarization measurement capability in the 100 − 300 keV energy range and thus provides a unique opportunity to attempt spectro-polarimetric studies of GRBs. Here we present the polarization data for the brightest 11 GRBs detected by CZTI during the first year of operation. Most of the GRBs show clear polarization signatures with ≥3σ detection significance for 4 GRBs and ∼2.5σ significance for another 3 GRBs. We could place meaningful upper limits for the remaining 4 GRBs. We provide the details of the various tests performed to validate the polarization measurements. While it is difficult to differentiate the various emission models with the current sample of polarization measurements, CZTI in its minimum lifetime of five years is expected to provide a large sample of polarization measurements which would lead to a better understanding of the prompt emission.

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Performance study of the gamma-ray bursts polarimeter POLAR

Cited by 3 publications

References 8 publications

Overview of the POLAR mission

Overview of the POLAR mission

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

Prompt Emission Polarimetry of Gamma-Ray Bursts with the AstroSat CZT Imager

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