SGR 1806−20 is a magnetar, a type of neutron star with a very powerful magnetic field, that was discovered in 1979 and identified as a soft gamma repeater. SGR 1806−20 is located about 13 kiloparsecs (42,000 light-years) [1] from Earth on the far side of …

sgr 1806-20是一顆位於人馬座的磁星（中子星的一種），也是人們已知的軟γ射線重複爆發源(sgr)之一。 它距離 地球 約50,000 光年 ，直徑不多於20 公里 ，自轉週期為7.5秒。

sgr 1806-20是一颗位于人马座的磁星（中子星的一种），也是人们已知的软γ射线复现源之一。 它距离地球约50,000光年，直径不多于20公里，自转周期为7.5秒。

2005年4月28日 · Here we report that SGR 1806–20 emitted a giant flare on 27 December 2004. The total (isotropic) flare energy is 2 × 10 46 erg, which is about a hundred times higher than the other two previously...

2015年9月4日 · A December 27, 2004, gamma-ray flare expands from SGR 1806–20 and eventually impacts Earth’s atmosphere in this illustrated conception. The nuclear furnaces in the Sun and stars create blistering...

2005年4月28日 · Here we describe a third giant flare, which came from the galactic SGR 1806–20 on 27 December 2004. Particle and γ-ray detectors onboard the Reuven Ramaty High Energy Solar Spectroscopic Imager...

The effect of the SGR1806-20 flare on the Earth's magnetic field was not large, but it was detectable. This first attempt to find a magnetar signature in the geomagnetic field clearly indicates that the high-resolution CHAMP magnetic data are optimal to capture the extremely bright flare from SGR 1806-20.

Of the millions of neutron stars in the Milky Way galaxy, SGR 1806-20 is one of only four known neutron stars with a unique property of occasionally releasing great flares of gamma-ray light. Scientists call this kind of neutron star a soft gamma-ray repeater.

2023年8月2日 · Here we report on the joint IXPE and XMM-Newton observations of the soft {\gamma}-repeater SGR 1806-20. The spectral and timing properties of SGR 1806-20 derived from XMM-Newton data are in broad agreement with previous measurements; however, we found the source at an all-time-low persistent flux level.

2005年3月2日 · Here we report that, on 2004 December 27, SGR 1806-20 emitted the brightest extra-solar transient event ever recorded, even surpassing the full moon brightness for 0.2 seconds. The total (isotropic) flare energy is 2x10^46 erg, 100 times higher than the only two previous events, making this flare a once in a century event.