12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room D(109/110)

[GA121] GRB Observations with H.E.S.S. II


  • Clemens HOISCHEN

Primary authors



The High Energy Stereoscopic System (H.E.S.S.) has been searching for counterparts of Gamma Ray Bursts (GRBs) for many years. In 2012 the system was upgraded with a fifth 28m diameter telescope which is equipped with stronger motors for rapid repointing. Its large light collection area of 600 m^2 improves the sensitivity to low-energy gamma-rays and even extends the energy range below 100 GeV. The search for counterparts continues now in the energy range of tens of GeV to tens of TeV, trying to open a new window to the part of the spectrum of these highly energetic explosions which is barely known from only few Fermi-LAT detections. In the past years, H.E.S.S. performed follow-up observations based on GRB detections by SWIFT-BAT and Femi-GBM/-LAT as a part of a generalised Target of Opportunity Alert system. This contribution will highlight key features of the Target of Opportunity Alert system, present follow-up statistics of GRBs as well as detailed results of promising follow-up observations.