Beijing, China - Jan 15, 2019 (CCTV-No access Chinese mainland)
1. Various of board introducing Gamma-ray Burst (GRB) polarimeter POLAR
2. Various of model of POLAR
3. SOUNDBITE (Chinese) Zhang Shuangnan, director of Particle Astrophysics Key Laboratory, Institute for High-energy Physics, Chinese Academy of Sciences (starting with shot 2):
"It has been a great challenge to measure the polarization of GRBs. This time we published the polarization measurement of five GRBs with high sensitivity, which is larger than all the samples scientists have measured in the past."

FILE: Jiuquan Satellite Launch Center, northwest China - Sept 15, 2016 (CCTV-No access Chinese mainland)
4. Launch of Tiangong-2 space laboratory

FILE: Space - Date Unknown (CCTV- No access Chinese mainland)
5. Various of animation of Tiangong-2 space laboratory

Beijing, China - Jan 15, 2019 (CCTV-No access Chinese mainland)
6. Various of researchers at work

The Gamma-ray Burst (GRB) polarimeter POLAR on China's Tiangong-2 space laboratory has completed its high-sensitivity measurement of GRBs and fulfilled all of its research objectives, according to China Manned Space Engineering Office on Tuesday.

Developed by a consortium of Chinese and European scientists, POLAR is the first high-sensitivity GRB polarimeter with a large effective detection area and a large field of view in the world. Aboard China's Tiangong-2 space lab launched on Sept 15, 2016, it has detected 55 GRBs during its operation life, and measured the polarization of five GRBs with high sensitivity, which is the largest GRB sample for high-sensitivity polarization measurement in the world.

"It has been a great challenge to measure the polarization of GRBs. This time we published the polarization measurement of five GRBs with high sensitivity, which is larger than all the samples scientists have measured in the past," said Zhang Shuangnan, director of Particle Astrophysics Key Laboratory at the Institute for High-energy Physics of Chinese Academy of Sciences.

The results of the research was published in the online version of Nature Astronomy on Monday, which are the best polarization measurement results of GRBs since its discovery in 1960s, and can help scientists gain a better understanding of some basic astrophysical processes, such as the formation of black holes and highly relativistic jets.