Published online by Cambridge University Press: 22 July 2013
The UFFO pathfinder mission will attempt to locate the optical afterglow of a GRB withinseconds of its detection and location by a wide field X-ray imager. It will be mounted onthe Lomonosov spacecraft for launch in 2013 and consists of a coded mask X-ray imager UBATto detect a GRB and estimate a direction vector which will be passed to the SMT opticalsystem which will rotate a moveable mirror to lock onto the GRB and direct the opticalafterglow to a camera with a ~17′ wide aperture. We present the design geometry ofthe UBAT instrument only, with results of simulations for a range of GRB types to showprobable photon integration times to be expected to extract a significant FOV imagereconstruction and GRB location.