[glenc (Glen)]

The gamma-ray burst GRB 130427A erupted on April 27th with record-setting power. That made it an easy target for two of NASA's orbiting observatories, major ground-based telescopes, and even one lucky backyard observer. It reached visual magnitude 7.4...

Three RAPTOR all-sky monitors recorded an optical counterpart at magnitude 7.4, 50 seconds before the Swift satellite trigger. Within a minute the optical glow was fainter than magnitude 10...

Its location, in northeastern Leo, was right ascension 11h 32m 33s, declination +27° 41′ 56″.

http://www.skyandtelescope.com/commu...206307581.html