Effective area seen by a photon with energy 38 keV to be detected in the reconstructed energy channel 2 (CTIME) for different arrival directions on a unit sphere around detector n0 for four different viewing directions on the sphere. The red arrow marks the line of sight of the detector n0 (optical axis), the dark cylinder symbolizes the detector housing and the magenta cylinder the detector crystal. The coordinate system is defined such that the z-axis is the pointing direction of the LAT and the x-axis points along the normal of the satellite side on which the b0 detector is mounted. Responses generated with gbm_drm_gen (Burgess et al. 2018; Burgess 2019; Berlato et al. 2019).