Fluence distribution of terrestrial gamma ray flashes observed by the Fermi Gamma-ray Burst Monitor

摘要: [1] The observed γray fluence distribution of terrestrial gamma ray flashes (TGFs) detected by the Fermi Gamma-ray Burst Monitor (GBM) is altered instrumental effects. We perform corrections for dead time, pulse pileup, and detection efficiency in a model-independent manner. A sample 106 GBM TGFs selected to include both that triggered weaker found using an off-line search. Detector time pileup lower each TGF causes have probability than brighter TGFs. Monte Carlo simulations are performed case correct these The corrected well fit with power law index α=−2.20±0.13. This consistent previous estimates other techniques. Neither high-fluence cutoff nor low-fluence limit found. also expressed units h−1 km−2 versus photons cm−2 per TGF.