The gamma-ray burst was first detected by NASA's Swift satellite in April 2009.
这个γ射线爆由NASA的“雨燕”观测卫星于2009年四月首先观测到。
NASA's Swift satellite picked up the X-ray afterglow of the September 16th gamma-ray burst.
美国航空航天局“雨燕”号卫星捕捉到的伽马射线余晖，产生于9月16日伽马射线爆发过后。
They make up roughly half of the burstsdetected by NASA's Swift satellite since its 2004 launch.
他们粗略整理了一半自2004年以来被NASA雨燕人造卫星所探测到的爆炸。
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