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H.E.S.S. detects historically high fluxes of Very High Energy gamma-rays from PKS 2155-304

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Benbow,  Wystan
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Costamante,  Luigi
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Benbow, W., Costamante, L., & Giebels, B. (2006). H.E.S.S. detects historically high fluxes of Very High Energy gamma-rays from PKS 2155-304. The Astronomer's Telegram, (#867).


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7F88-2
Abstract
We report on the H.E.S.S. observations of the blazar PKS 2155-304 at VHE gamma-rays (E>200 GeV) varying between ~40 and ~100% of the Crab flux. On the night of 7/24-25 the source was seen in *preliminary* analyses with a significance of 30 sigma/sqrt(hr), or an average 89% of HESS Crab flux above 200 GeV. On the night of 7/25-26 the source was seen with 25 sigma/sqrt(hr) or an average of 62% Crab. On the night of 7/27-28 the source was seen with 14 sigma/sqrt(hr) with a light weather degradation. HESS will monitor PKS 2155-304 until Aug. 03, 2007. Predicted observation windows are listed below, within which RXTE ToO observations are scheduled. Simultaneous observations at all wavelengths are strongly encouraged. Date Start Time(UT) Stop Time(UT) JUL 29 00:20:00 JUL 29 01:50:00 JUL 29 23:50:00 JUL 30 01:20:00 JUL 30 01:30:00 JUL 30 03:00:00 JUL 30 23:30:00 JUL 31 01:00:00 AUG 1 00:40:00 AUG 1 02:00:00 AUG 2 00:10:00 AUG 2 01:40:00 AUG 3 01:10:00 AUG 3 02:50:00