Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-14
Astronomy and Astrophysics
Astrophysics
This paper was presented as a poster(#0393) at the 30th International Cosmic Ray Conference on July 3-11th 2007 in Merida, Mex
Scientific paper
Absolute calibration of the Pierre Auger Observatory fluorescence detectors uses a 375 nm light source at the telescope aperture. This end-to-end technique accounts for the combined effects of all detector components in a single measurement. The relative response has been measured at wavelengths of 320, 337, 355, 380 and 405 nm, defining a spectral response curve which has been normalized to the absolute calibration. Before and after each night of data taking a relative calibration of the phototubes is performed. This relative calibration is used to track both short and long term changes in the detector's response. A cross check of the calibration in some phototubes is performed using an independent laser technique. Overall uncertainties, current results and future plans are discussed.
Bauleo Pablo
Becker B. R.
Brack J.
Caruso R.
Delle Fratte C.
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