WE WILL FIT THE SPECTRA OF INDIVIDUAL TGFS OBSERVED WITH THE FERMI GAMMA-RAY BURST MONITOR USING TWO MODELS FOR WHERE THE ELECTRONS ARE ACCELERATED: IN LARGE-SCALE ELECTRIC FIELD REGIONS OR IN LOCALIZED HIGH-FIELD REGIONS AT THE TIPS OF LIGHTNING LEADERS. THESE TWO MODELS PREDICT INTRINSIC DIFFERENCES IN THE SPECTRA AND DIFFERENCES IN THE BEAM WIDTHS WHICH CAUSE DIFFERENCES IN THE SPECTRA AT SOME OFFSETS FROM THE SOURCE. THE SPECTRAL FITTING RESULTS WILL BE USED TO DISTINGUISH BETWEEN THE TWO MODELS FOR WHERE THE ELECTRONS THAT PRODUCE TGFS ARE ACCELERATED TO RELATIVISTIC ENERGIES.

The University Of Alabama In Huntsville

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