Status of the BATSE enhanced earth occulation analysis package for studying point sources

The Compton Gamma‐Ray Observatory’s Burst and Transient Source Experiment (BATSE) has a powerful capability to provide nearly uninterrupted monitoring in the 25 keV—1 Mev range of cosmic point sources using occulation by the Earth. A number of interesting results have been obtained to date using the BATSE Mission Operations (MOPS) Level I analysis system. We have been constructing a more physical model for the background variations which will allow use of more data, enhancing the sensitivity by a factor of several. Our ‘‘enhanced’’ package, written in IDL primarily for a VMS environment, accepts input data in the MOPS format. It fits for the diffuse background (including Earth blockage), prompt cosmic‐ray effects, South Atlantic Anomaly activation, atmospheric cosmic‐ray secondaries, and cosmic sources in 14 Medium Energy Resolution energy bands of the Large Area Detectors. Features include the ability to correlate set and rise of a given source and to handle multiple sources within the fit window. The count spectrum is deconvolved using the detector energy response matrix to yield a source photon spectrum. We describe the current status and performance of the system.