TITLE:   GCN CIRCULAR
NUMBER:  11950
SUBJECT: GRB 110420B: Spectral lag indicates short hard burst
DATE:    11/04/21 13:39:01 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>

S.D. Barthelmy (GSFC) and J. Norris (BSU)
report:

For GRB 110420B (Trigger 451794, GCNs 11944 & 11946),
the spectral lag analysis of the Swift-BAT data for 40 msec
covering the spike, yields a lag of 0.6 +/-2.0 msec for the
25-50 to 100-300 keV bands and 2.4 +4/-2 msec for the
15-25 to 50-100 keV bands, both using a lightcurve binning of 2 msec.