Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) analysis and cross-calibration with Whipple 10 m

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Behera, Bagmeet
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In this work the Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) instrument is calibrated against the Whipple TeV system as a reference to get a measure of the sensitivity of the instrument. The electronics gain of the system is quantified by the digital counts to photo-electron (d.c./p.e.) ratio, and is a measure of the system's response to a photo-electron collected by the photo-detectors. This ratio is required to reconstruct the number of Cherenkov photons collected by the telescope. The Cherenkov light density and angular distribution in the focal plane of an Imaging Atmosphere Cherenkov Telescope (IACT) allows us to reconstruct the atmospheric-shower parameters. Thus the d.c./p.e. is an important characteristic measure for the instrument. To calculate this measure, an event analysis software for the SGARFACE instrument is prepared, complete with image parameter calculation and event display. Then cosmic-ray events that simultaneously triggered both Whipple and SGARFACE are used to compare the charges (d.c.) given by both instruments. The known (previously calibrated) d.c. to p.e. ratio of the Whipple, is then used to get an estimate of the d.c./p.e. for SGARFACE. The SGARFACE on the Whipple 10 m telescope, at Mt. Hopkins Arizona, is an instrument designed to detect bursts of low energy [Difference] 250 MeV gamma-rays which could be the result of the last stage of PBH evaporation. It has been taking data, concurrently with the Whipple TeV system for more than two years now. The existence of Primordial Black Holes and their evaporation mechanism can only be ascertained by detecting and identifying radiations that might be their signature. Previous attempts to measure the radiation from PBH have put rough upper limits at various energies. SGARFACE is designed to search for PBH radiation at previously unexplored lower energies. The results of this work would enable the data taken by the instrument to be interpreted and analyzed to search for long duration bursts that might be signature of the final explosive stage of PBH evaporation.

Sat Jan 01 00:00:00 UTC 2005