Light curves of the eight GRBs with the black hole as a central engine: Na I, BGO, and LLE light curves are presented in black, red, and blue color, respectively, from top to bottom. In the bottom panel of each GRB light curve, LAT photons are shown in magenta color with energy (in GeV) information on the y-axis. The cyan shaded region marks the time interval used for time-integrated spectral analysis, and the green vertical line represents the trigger time of the GRB.