Detection of Very-High-Energy Gamma-rays from PKS 0903-57 by H.E.S.S.

ATel #13632; S. J. Wagner (on behalf of the H. E.S. S. Collaboration)
on 13 Apr 2020; 19:47 UT
Credential Certification: Stefan J. Wagner (swagner@lsw.uni-heidelberg.de)

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The H.E.S.S. array of imaging atmospheric Cherenkov telescopes was used to carry out follow-up observations of the Intermediate BL Lacertae Object PKS 0903-57 (z = 0.695), which had been reported to be in a flaring state at high-energy gamma-rays (> 100 MeV) by AGILE (Lucarelli et al., ATel#13602) and at high-energy and very-high-energy (> 100 GeV) by Fermi-LAT (Buson et al., ATel#13604) on April 1, 2020. Prompt follow-up observations by H.E.S.S. were hampered by unfavourable weather conditions. However, successful observations were carried out in two runs totalling 49 minutes on April 13, 2020, resulting in a significant detection at > 25 standard deviations in a preliminary real-time analysis. Further analyses of the data are on-going and further H.E.S.S. observations are planned. We strongly encourage follow-up at all wavelengths. 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, France, Germany, Ireland, Japan, the Netherlands, Poland, South Africa, Sweden, UK, and the host country, Namibia. For more details see https://www.mpi-hd.mpg.de/hfm/HESS/

H.E.S.S.