Calibration parameters of GALI ISS mission - A GAmma ray Localizing Instrument.

The detection of astrophysicalγ -Ray Bursts (GRBs) has always been intertwined with the challenge of identifying the direction of the source.

Accurate angular localization of better than a degree has been achieved to date only with heavy instruments on large satellites, and a limited field of view.  Our simulations of realistic GRBs and background show that the achievable angular localization accuracy of the Gamma-ray Burst Localizing Instrument (GALI) with 362 scintillators is < 2° .

In this work, we will describe the experiments for lowering the photon-energy threshold and optimizing the electronics (ASIC, FPGA, and CPU) parameters. Namely, we examine the influence of the ASIC bias voltage, threshold voltage and its different calibration modes on spectra of laboratory γ-ray sources. In addition, we will represent environmental experiments and their results, trying to minimize the external disturbances