Yonetoku 2010 第一个观测伽马暴本身偏振的仪器 GAP

主要内容:
搭载在日本的IKAROS卫星上，此小卫星于2010.5.21上天。

预计如果理论认为偏振在40%的话，他们每年可以看到2到4个（好少啊）。

精彩摘抄:

GAP示意图

观测到了第一个暴，没说偏振

文章信息:

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Title:		Gamma-Ray Burst Polarimeter - GAP - aboard the Small Solar Power Sail Demonstrator IKAROS
Authors:		Yonetoku, D.; Murakami, T.; Gunji, S.; Mihara, T.; Sakashita, T.; Morihara, Y.; Kikuchi, Y.; Fujimoto, H.; Toukairin, N.; Kodama, Y.; Kubo, S.; IKAROS Demonstration Team
Publication:		eprint arXiv:1010.5305
Publication Date:		10/2010
Origin:		ARXIV
Keywords:		Astrophysics - Instrumentation and Methods for Astrophysics
Comment:		Submitted to Publications of the Astronomical Society of Japan (PASJ), 23 pages, 14 figures
Bibliographic Code:		2010arXiv1010.5305Y

Abstract

The small solar power sail demonstrator "IKAROS" is a Japanese engineering verification spacecraft launched by H-IIA rocket on May 21, 2010 at JAXA Tanegashima Space Center. IKAROS has a huge sail with 20 m in diameter which is made of thin polyimide membrane. This sail converts the solar radiation-pressure into the propulsion force of IKAROS and accelerates the spacecraft. The Gamma-Ray Burst Polarimeter (GAP) aboard IKAROS is the first polarimeter to observe the gamma-ray polarization of Gamma-Ray Bursts (GRBs) during the IKAROS cruising phase. GAP is a tinny detector of 3.8 kg in weight and 17 cm in size with an energy range between 50-300 keV. The GAP detector also plays a role of the interplanetary network (IPN) to determine the GRB direction. The detection principle of gamma-ray polarization is the anisotropy of the Compton scattering. GAP works as the GRB polarimeter with the full coincidence mode between the central plastic and the surrounding CsI detectors. GAP is the first instrument, devoted for the observation of gamma-ray polarization in the astronomical history. In this paper, we present the GAP detector and its ground and onboard calibrations.

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