TITLE: GCN CIRCULAR NUMBER: 11113 SUBJECT: GRB 100816A: Swift-BAT spectral lag results DATE: 10/08/16 18:58:58 GMT FROM: Scott Barthelmy at NASA/GSFC J. Norris (U. Denver), T. N. Ukwatta (GWU/GSFC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), M. Stamatikos (OSU/NASA/GSFC), and T. Sakamoto (GSFC/UMBC) for the Swift-BAT team: For GRB 100816A (Oates et al GCN 11102), the BAT team has analyzed the spectral lags for the data from ~T-1 sec to ~T+3 sec using unmask-weighted light curves. The spectral lags were measured between standard BAT energy bands: channel 1 (15-25 keV), 2 (25-50 keV), 3 (50-100 keV) and 4 (100-350 keV) are given below. Lag Ch4-2 10 +/- 25 ms Lag Ch3-1 20 +/- 20 ms We conclude from this analysis that the burst is consistent with being a short hard burst, but the error bars are too large to be definitive.