After further analysis of the BAT ground detected GRB 100413B (Racusin et al., GCN 10593), we can now confirm that it is a real burst. It was detected at the level of 12.4 sigma in 10 seconds of data. The light curve shows a peak beginning at ~T-7 sec, and lasting until at least T+18 sec, when the spacecraft slewed away from the burst due to a pre-planned target. Our best position is...Full Text

At 08:42:41 UT on 2010-04-13, BAT detected a rate increase GRB 100413B (trigger=419380). On-board analysis of two separate 1.024 second time intervals found sub-threshold peaks (~5 sigma) at a consistent location in both images, but further on-board analysis was truncated by a preplanned slew. Subsequent ground analysis of the data improved our confidence in the detection and refined the location...Full Text