On-ground calibrations of the GRID-02 gamma-ray detector

TL;DR

This paper details the calibration process of the GRID-02 gamma-ray detector, including laboratory measurements and validation with simulations, to ensure accurate performance in space-based gamma-ray monitoring.

Contribution

It provides the first comprehensive calibration and validation of the GRID-02 detector's performance parameters using laboratory data and Geant4 simulations.

Findings

Calibration of energy response and effective area.

Validation of Geant4 simulation model.

Assessment of temperature-bias effects.

Abstract

The Gamma-Ray Integrated Detectors (GRID) are a space project to monitor the transient gamma-ray sky in the multi-messenger astronomy era using multiple detectors on-board CubeSats. The second GRID detector, GRID-02, was launched in 2020. The performance of the detector, including the energy response, effective area, angular response, and temperature-bias dependence, is calibrated in the laboratory and presented here. These measurements are compared with particle tracing simulations and validate the Geant4 model that will be used for generating detector responses.