Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-12
Astronomy and Astrophysics
Astrophysics
Contribution to the 30th International Cosmic Ray Conference, Merida Mexico, July 2007; 4 pages, 2 figures
Scientific paper
FRAM - F/(Ph)otometric Robotic Atmospheric Monitor is the latest addition to the atmospheric monitoring instruments of the Pierre Auger Observatory. An optical telescope equipped with CCD camera and photometer, it automatically observes a set of selected standard stars and a calibrated terrestrial source. Primarily, the wavelength dependence of the attenuation is derived and the comparison between its vertical values (for stars) and horizontal values (for the terrestrial source) is made. Further, the integral vertical aerosol optical depth can be obtained. A secondary program of the instrument, the detection of optical counterparts of gamma-ray bursts, has already proven successful. The hardware setup, software system, data taking procedures, and first analysis results are described in this paper.
BenZvi Segev
Boháčová Martina
Connolly Brian
for the Pierre Auger Collaboration
Grygar Jiri
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