HiZ-GUNDAM is a future satellite mission designed for exploring the early universe using gamma-ray bursts (GRBs). The satellite is equipped with two main instruments: a wide field X-ray monitor (WFXM) and a near infrared telescope (NIRT). And its mission data processing unit (MPU) plays an important role in data processing. When a transient source occurs and the X-rays enter the WFXM, a cross-shaped image is produced on the focal plane image sensor. Once the WFXM’s data are sent to the MPU, the direction of the source is determined from the center position. Furthermore, if there are no known stellar objects in this direction and if they are not hot pixels or other anomalies, the event is classified as a GRB candidate. To evaluate the software for this series of judgments, we investigated the angular resolution by this software algorithm utilizing the cross image obtained by the lobster eye optics (LEO).
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