[vsnet-grb-info 14500] GRB 140209A: Swift-BAT Spectral lag analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15814
SUBJECT: GRB 140209A: Swift-BAT Spectral lag analysis
DATE:    14/02/10 13:53:26 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

J. Norris (BSU), S. D. Barthelmy (GSFC), A. Lien (GSFC), C. Markwardt (GSFC),
T. Sakamoto (AGU), N. Gehrels (GSFC) report:

We report the spectral lag analysis for GRB 140209A (GCN Circ. 15808 & 15812)
based on the BAT data.  Using 4-ms binned light curve, the spectral lag
for the 25-50 keV to 100-350 keV bands is 28 (+10/-7) ms, and +34 (+8/-5) ms
for the 15-25 keV to 50-100 keV bands.  These lag values are consistant with a Long GRB.
Further, the extended emission is both shorter than the typical extended eimssion of a
Short GRB, and its shape is exponential in decay instead of more flat-like.
And lastly, there is pecursor emission.  The lag for the precursor
in the 15-25 keV to 50-100 keV bands is 150 (+36/-30) ms.