[vsnet-grb-info 21344] GRB 181123B: Swift-BAT lag analysis and search for extended emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23443
SUBJECT: GRB 181123B: Swift-BAT lag analysis and search for extended emission 
DATE:    18/11/24 03:11:55 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

J. P. Norris (BSU), S. D. Barthelmy (GSFC), A. Y. Lien (GSFC/UMBC)
report:

We report the spectral lag analysis and the search for extended emission
for GRB 181123B (Lien et al., GCN Circ. 23432).

Using the 8-ms binned light curve, the spectral lag of the short pulse 
is 6 (+11, -11) ms for the 100-350 keV to 25-50 keV bands, and 10 (+14, -11) ms
for the 50-100 keV to 15-25 keV bands.  These lag values are consistent with 
a short GRB.

The Bayesian block analysis using the mask-tagged light curves suggests that 
there may be a marginal (~ 3 sigma) extended emission that lasts until ~T+60 s.