Image Details
Caption: Figure 1.
The top plot shows the uncorrected light curve of GRB 221009A in the 20 keV to 40 MeV energy range as seen by the three Fermi-GBM detectors with the lowest continuous viewing angles. The uncorrected light curve is divided into eight time intervals (I–VIII) differentiated by vertical dashed lines. Beyond region VIII (right of the last vertical dashed line at t 0 + 1464 s) marks the time when GRB 221009A was occulted by the Earth. Intervals IV, V, and VI are further subdivided into three subintervals shown in the bottom three panels in the same energy range (20 keV to 40 MeV). The NaIs, BGOs, and LLE plots show the uncorrected light curve of GRB 221009A in different energy bands. The two gray vertical shaded regions in the Fermi-GBM plots denote the BTIs of Fermi-GBM (t 0 + 219.0 s to t 0 + 277.0 s & t 0 + 508.0 s to t 0 + 514.0 s). The red vertical shaded region in the LLE plot denotes the revised BTI of Fermi-LAT (t 0 + 217 s to t 0 + 280 s).
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© 2023. The Author(s). Published by the American Astronomical Society.
