GRB observations with H.E.S.S. II
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Date
Authors
Hoischen, Clemens
Garrigoux, Tania
Balzer, Arnim
Bissaldi, Elisabetta
Füssling, Matthias
Journal Title
Journal ISSN
Volume Title
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PoS
Abstract
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 (CT5) which is equipped with faster motors for rapid repointing, marking the start of
the second phase of H.E.S.S. operation (H.E.S.S. II). CT5s large light collection area of 600m2
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. A detection in this energy range would open a new window to the part of the spectrum of
these highly energetic explosions which Fermi-LAT has only successfully detected in a reduced
subset of events, with rather limited statistics. In the past years, H.E.S.S. has performed followup
observations based on GRB detections by Swi f t-BAT and Fermi-GBM/-LAT. This Target
of Opportunity observation program was carried out with 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
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Citation
Hoischen, C. et al. 2017. GRB observations with H.E.S.S. II. 35th International Cosmic Ray Conference - ICRC2017 10-20 July, 2017 Bexco, Busan, Korea. Proceedings of science, 301: Article no 636. [https://pos.sissa.it/301/636/pdf]