SKY EXPOSURE AND TRIGGER EFFICIENCY The infamous data gaps have severely complicated efforts to generate sky exposure and trigger efficiency tables for post 1B data. These will be provided to the GROSSC when they are available. Until then, the 1B tables can be used with appropriate modification. The trigger efficiency is the probability as a function of peak flux that a burst will exceed the BATSE trigger threshold. It depends on the background rate and the trigger threshold settings. Since these have not changed significantly since the 2B catalog, the previous efficiency table is still satisfactory. The sky exposure is the amount of time that BATSE could detect bursts as a function of the declination of the burst. It depends on the CGRO orbit, times that the instrument is disabled, and the time that BATSE is reading out a burst. The previous 2B catalog table of sky exposure provides a satisfactory function of relative exposure as a function of declination. However the absolute values of the exposure have increased due to a reduction of solar triggers. For comparison, the 2B catalog covered 691 calendar days and had an efficency (averaged over declination) of 0.36. The most recent data (3B-2B) covered 559 calendar days and had an efficiency of 0.41. The entire 3B catalog covered 1250 calendar days, and had an efficency of 0.38. The efficiency of the 1B catalog was computed; the later efficencies were scaled from the 1B value assuming that the all-sky burst rate is constant.