Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2899g&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
Gamma-ray experiments using the imaging atmospheric Cherenkov technique have a relatively modest angular resolution of typically 0.05 to 0.1 degrees per event. The centroid of a point-source emitter, however, can be determined with much higher precision, down to a few arcseconds for strong sources. The localization of the Crab TeV source with HEGRA, for example, was dominated by systematic uncertainties in telescope pointing at the 25 arcsecond level. For H.E.S.S. with its increased sensitivity it is therefore desirable to lower the systematic pointing error by a factor of 10 compared to HEGRA. As the exposure times are on a nanosecond scale it is not necessary to actively control the telescope pointing to the desired accuracy, as one can correct the pointing offline. We demonstrate that we can achieve the desired 3 arcseconds pointing precision in the analysis chain by a two step procedure: a detailed mechanical pointing model is used to predict pointing deviations, and a fine correction is derived using stars observed in a guide telescope equipp ed with a CCD chip.
E. S. S Collaboration H.
Gillessen Stefan
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