COBE OBSERVATIONS OF THE MICROWAVE COUNTERPART OF GRBS

We have used the data from the COBB satellite to search for delayed mi crowave emission (31 - 90 GHz) from Gamma Ray Bursts (GRBs). The large 7 degrees beam of COBE is well matched to the large positional uncert ainties in the GRB locations, although it also means that fluxes from (point source) GRB objects will be diluted. In view of this we are doi ng a statistical search of the GRBs which occurred during the currentl y released COBE DMR data (years 1990 and 1991), which overlap similar to 200 GRBs recorded by GRO. Here we concentrate on just the top 10 GR Bs (in peak counts/second). We obtain the limits on the emission by co mparing the COBE fluxes before and after the GRB at the GRB location. Since it is thought that the microwave emission should lag the GRB eve nt, we have searched the GRB position for emission in the few months f ollowing the GRB occurrence.