Fig. 2.

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Analysis of the Fermi/GBM field of view for GRB 220107A illustrating the visibility of the GRB position relative to Earth occultation. The upper panel shows a full-sky map in celestial coordinates and the location of GRB 220107A marked by a pink star. The pointing directions of all 14 GBM detectors at the trigger time are indicated by light-gray circles, which represent the detector normal directions and do not correspond to the detectors’ fields of view. The Galactic plane is shown as a thick gray band, with the Galactic center marked by a circle. The Earth, as seen from the Fermi spacecraft in orbit, is shown as a blue polygon, indicating the Earth-occulted region of the sky. The position of the Sun is marked by a yellow smiley symbol. The lower panel shows the geolocation of the Fermi spacecraft at the time of the trigger, marked by a red circle with the mission elapsed time. The red shaded region highlights the South Atlantic Anomaly, while the solid blue line indicates the orbital trajectory of the Fermi spacecraft.
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