Abstract
Milagro is a wide field (2 sr) high duty cycle (>90%) ground‐based water Cherenkov detector designed primarily for astrophysical observations in the 0.1–100 TeV energy range. In the standard mode of operation, Milagro data is used to reconstruct the direction of an incoming high energy particle by analyzing the timing information of a large number of photomultiplier tubes that are triggered in coincidence by the air shower generated when such a particle interacts with the Earth's atmosphere. In addition, Milagro data can be analyzed in “scaler mode”, where the rates of individual photomultiplier tubes can be used to detect emission above ∼1 GeV (albeit with no directional information). Here, we present an analysis of the Milagro data using both modes of operation, over the 1 GeV–100 TeV energy range, to search for emission from the ∼60 GRBs that have occurred in the Milagro field of view in the three years since the launch of Swift.
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