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GCN Circular 6631

Subject

GRB 070714B: Swift-BAT spectral lag for the SHB

Date

2007-07-16T18:48:06Z (17 years ago)

From

Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>

J. Norris (Stanford U), S.D. Barthelmy (GSFC), T. Ukwatta (GWU)
on behalf of the Swift-BAT team:
 
Using the event-by-event data from Swift-BAT, the spectral lag
for GRB 070714B (Racusin, et al., 6620; Barbier, et al., 6623) is:
     9 ms +- 4 ms   (100-350 to 25-50 keV)
    14 ms +- 7 ms   ( 50-100 to 15-25 KeV)
using 4-msec binning (for the 2.9-sec interval covering the initial spike).
This is consistent with "zero lag" for short hard bursts.