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The main calibration items of Fluorescence Detector (FD) in the Telescope Array (TA) observatory are the fluorescence yield, the atmospheric attenuation and the detector sensitivity. We are developing a flying standard light source which is called Opt-copter calibration system in order to calibrate the FDs. By mounting a high accurate global positioning system(GPS) device, the systematic error of the measured light source position is expected to be less than 1 m. A photodiode mounted directly on the Opt-copter does measure the relative light intensity of each generating pulse. We report the progress of the Opt-copter development and the result of its test performance at the TA site.

Calibration of a fluorescence detector using a flying standard light source for the Telescope Array observatory