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H.E.S.S. follow-up of IceCube-170922A

ATel #10787; Mathieu de Naurois for the H. E.S. S. collaboration
on 27 Sep 2017; 14:33 UT
Credential Certification: Fabian Schüssler (fabian.schussler@cea.fr)

Subjects: VHE, Neutrinos

Referred to by ATel #: 10799, 10817, 10830, 10833, 10844

The H.E.S.S. array of imaging atmospheric Cherenkov telescopes was used to carry out follow-up observations of a high-energy neutrino detected by IceCube on 22 September 2017 at 20:54:30.43 UTC. H.E.S.S. observed the region around the IceCube best fit position (RA=77.43 deg, Dec=5.72 deg; GCN circular #21916) in two consecutive nights for about 1h each. First observations started 23 September 2017 at 01:05 UTC (about 4h after the neutrino detection). A second set of observations were obtained the following night (24 September 2017 at 03:10 UTC). A preliminary on-site calibration and analysis searching for a point-like gamma-ray source from within the 90% uncertainty region of the neutrino event IceCube-170922A revealed no significant detection. H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes for the detection of very-high-energy gamma-ray sources and is located in the Khomas Highlands in Namibia. It was constructed and is operated by researchers from Armenia, Australia, Austria, the Czech Republic, France, Germany, Ireland, Netherlands, Japan, Poland, South Africa, Sweden, UK, and the host country, Namibia.