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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 284648.0, MPI für Kernphysik / High-Energy Astrophysics
H.E.S.S. detects historically high fluxes of Very High Energy gamma-rays from PKS 2155-304
Authors:Benbow, Wystan; Costamante, Luigi; Giebels, Berrie
Corporate body:W. Benbow et al. on behalf of the H.E.S.S. Collaboration
Research Context:GeV, Request for Observations, AGN
Date of Publication (YYYY-MM-DD):2006-07-27
Title of Journal:The Astronomer's Telegram
Journal Abbrev.:ATel
Issue / Number:#867
Full name of Issue-Editor(s):R. E. Rutledge, Derek Fox
Review Status:not specified
Abstract / Description: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
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
External Affiliations:Laboratoire Leprince Ringuet-IN2P3/CNRS
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