page_title: GRB 130427A
hierarchical_section_title: GRB 130427A
caption_attribution_description: English: The maps in this animation show how the sky looks at gamma-ray energies above 100 million electron volts (MeV) with a view centered on the north galactic pole. The first frame shows the sky during a three-hour interval prior to GRB 130427A. The second frame shows a three-hour interval starting 2.5 hours before the burst, and ending 30 minutes into the event. The Fermi team chose this interval to demonstrate how bright the burst was relative to the rest of the gamma-ray sky. This burst was bright enough that Fermi autonomously left its normal surveying mode to give the LAT instrument a better view, so the three-hour exposure following the burst does not cover the whole sky in the usual way.
context_page_description: GRB 130427A was a record-setting gamma-ray burst, discovered starting on April 27, 2013. This GRB was associated to SN 2013cq, of which the appearance of optical signal was predicted on May 2, 2013 and detected on May 13, 2013. The Fermi space observatory detected a gamma-ray with an energy of at least 94 billion electron volts. It was simultaneously detected by the Burst Alert Telescope aboard the Swift telescope and was one of the brightest bursts Swift had ever detected. It was one of the five closest GRBs, at about 3.6 billion light-years away, and was comparatively long-lasting.
  Fermi's Large Area Telescope recorded one gamma ray with an energy of at least 94 billion electron volts, 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.
  — NASA
  Swift space observatory also observed the burst, quickly determining its location. The X-ray afterglow of the burst was so bright that Swift was able to observe it for the next six months.
context_section_description: GRB 130427A was a record-setting gamma-ray burst, discovered starting on April 27, 2013. This GRB was associated to SN 2013cq, of which the appearance of optical signal was predicted on May 2, 2013 and detected on May 13, 2013. The Fermi space observatory detected a gamma-ray with an energy of at least 94 billion electron volts. It was simultaneously detected by the Burst Alert Telescope aboard the Swift telescope and was one of the brightest bursts Swift had ever detected. It was one of the five closest GRBs, at about 3.6 billion light-years away, and was comparatively long-lasting.
  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.
  — NASA
  Swift space observatory also observed the burst, quickly determining its location. The X-ray afterglow of the burst was so bright that Swift was able to observe it for the next six months.
  The emission was also detected using radio, infrared and visible radiation from ground-based telescopes using the sky location from Swift. The burst was observed with a 350mm optical telescope and its brightness measured. The visible apparent magnitude decreased from 13 to 15.5 over a three-hour period starting at 08:05:12 UTC 27 April 2013. The Catalina Real-time Transient Survey also detected the burst optically, independent of the alert. It received designation CSS130502:113233+274156. It was found at right ascension 11:32:32.90, and declination +27:41:56.5 (J2000). The SDSS catalogue shows a galaxy (SDSS J113232.84+274155.4) almost coincident with this position at magnitude r=21.26 but with no SDSS spectrum obtained.
caption: Before and after in 100+ MeV light
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