The brightest gamma ray burst ever recorded arrived on December 27, 2004 at Universal Time 21 hours, 30 minutes. The blast was 100 times more intense than any burst that had been previously recorded, equaling the brightness of the full Moon, but at gamma ray wavelengths. Gamma ray counts spiked to a maximum in 1.5 seconds and then declined over a 5 minute period with 7.57 second pulsations. It was determined to have originated from SGR 1806-20, a neutron star 20 kilometers in diameter which rotates once every 7.5 seconds, matching the GRB pulsation period. SGR 1806-20 is located about...
