TITLE: GCN CIRCULAR NUMBER: 12999 SUBJECT: GRB 120229A: Spectral lag analysis DATE: 12/02/29 22:11:32 GMT FROM: Scott Barthelmy at NASA/GSFC J. Norris (BSU), S.D. Barthelmy (GSFC) for the BAT Team: We report the spectral lag analysis for GRB 120229A (GCN Circ. 12997) based on the BAT data. Using 4-ms binned light curves, the spectral lag for the 15-25 keV to 50-100 keV bands is 0.8 +-8 msec, and 3.6 +5/-7 msec for the 25-50 keV to 100-350 keV bands for both peaks combined. These lag values place this burst in the short burst category.