BATSE OSSE RAPID BURST RESPONSE

The BATSE and OSSE instrument teams have modified flight software to p romptly (within 2 min of trigger) slew the OSSE detectors to burst loc ations determined on-board by BATSE. This enables OSSE to make sensiti ve searches for prompt and delayed post-burst line and continuum emiss ion above 50 keV. In the best cases our sensitivity will be more than an order of magnitude better than any other search in this energy rang e. We expect to slew to 1-2 bursts per month, based on the OSSE FOV an d BATSE event rate. Detections or limits from continued operation of t his system may provide significant constraints on burst models. As an example of the observations made using this system, we present prelimi nary limits for post-burst emission from GRB 950223 on several time sc ales.