A French-Chinese satellite blasted off Saturday on a hunt for the mightiest explosions in the universe, in a notable example of cooperation between a Western power and the Asian giant.

Developed by engineers from both countries, the Space Variable Objects Monitor (SVOM) will seek out gamma-ray bursts, the light from which has travelled billions of light years to reach Earth.

The 930-kilogram satellite carrying four instruments — two French, two Chinese — took off around 3:00 pm (0700 GMT) aboard a Chinese Long March 2-C rocket from a space base in Xichang, in the southwestern province of Sichuan, AFP journalists witnessed.

Gamma-ray bursts generally occur after the explosion of huge stars — those more than 20 times as big as the sun — or the fusion of compact stars.

The extremely bright cosmic beams can give off a blast of energy equivalent to over a billion billion suns.