GRB 160625B

GRB 160625B was a bright gamma-ray burst (GRB) detected by NASA's Fermi Gamma-ray Space Telescope on 25 June 2016 and, three minutes later, by the Large Area Telescope.^[1][2][3] This was followed by a bright prompt optical flash, during which variable linear polarization was measured.^[4] This was the first time that these observations were made when the GRB was still bright and active.^[5] The source of the GRB was a possible black hole, within the Delphinus constellation,^[6] about 9 billion light-years (light travel distance) away (a redshift of z = 1.406).^[7] It had a fluence of 5.7×10⁻⁴ erg cm⁻², and energy of 5 × 10⁵⁴ erg.^[8] The burst lasted over 11 minutes (680 s),^[9][10] and is one of the most energetic bursts ever recorded.^[9]

GRB 160625B

Typical Gamma-Ray Burst (illustration)
Event type	Gamma-ray burst
Duration	680 seconds
Right ascension	20h 34m 23.25s[1]
Declination	+06° 55 ′ 10.5″[1]
Other designations	GRB 160625B
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