[1] Fermi's Large Area Telescope (LAT) recorded one gamma ray with an energy of at least 94 billion electron volts (GeV), or some 35 billion times the energy of visible light, and about three times greater than the LAT's previous record.

The GeV emission from the burst lasted for hours, and it remained detectable by the LAT for the better part of a day, setting a new record for the longest gamma-ray emission from a GRB.The Swift space observatory also observed the burst, quickly determining its location.

The emission was also detected using radio, infrared and visible radiation from ground-based telescopes using the sky location from Swift.

The visible apparent magnitude decreased from 13 to 15.5 over a three-hour period starting at 8:05:12 UTC 27 April 2013.

[8] The Catalina Real-time Transient Survey also detected the burst optically, independent of the alert.