The Search for >100 GeV Photons from Gamma Ray Bursts with HAWC*

To date, no photons above 100 GeV have been detected from a Gamma-Ray Burst (GRB). The detection or improved limits on this high energy emission would play an important role in constraining GRB emission models. The High Altitude Water Cherenkov (HAWC) observatory is well suited to study GRB spectra above 100 GeV; it is sensitive to the extensive air showers produced by ~0.1-100 TeV photons, and with its large instantaneous field of view (~2sr) and high duty cycle HAWC is capable of observing the prompt emission of tens of GRBs per year. We present the results of recent efforts to enhance HAWC's 0.1-1 TeV sensitivity through improvements to its extensive air shower reconstruction algorithms and discuss their impact on HAWC's analysis of the >100 GeV gamma-ray emission of known GRBs.