TITLE: GCN GRB OBSERVATION REPORT NUMBER: 532 SUBJECT: BATSE GRB trigger criteria changed DATE: 00/02/04 15:37:31 GMT FROM: Charles Meegan at NASA/MSFC C. Meegan (NASA/MSFC) reports for the BATSE team: The BATSE on-board burst trigger algorithm was revised at 14:18 UT on February 4 to include only counts in channel 4 (>300 keV). The intent is to optimize for Terrestrial Gamma Flashes (TGFs). Hard GRBs will continue to generate triggers, but at a lower rate. We expect to remain in this trigger mode for at least a week.