Fermi observations of GRB 100116A: From precursor to afterglow

Author: Sylvia Zhu

Abstract: GRB 100116A was detected by both the Large Area Telescope (LAT) and Gamma-ray Burst Monitor (GBM) onboard the Fermi satellite. It is the first long LAT burst with a precursor, and the LAT burst with the longest separation between the precursor and dominant emission (∼80 seconds). Such a long quiescent interval places strong constraints on models of precursor emission. We present a spectral and temporal study of the emission from precursor to afterglow, from 8 keV to 200 GeV using all of the Fermi instruments. In particular, the new LAT Low Energy (LLE) events - which bridge the energy gap between the GBM and the LAT standard events - proved to be crucial in constraining the spectral fits.