GCN Circular 16771
Subject
GRB 140903A: Swift-BAT Spectral lag analysis
Event
Date
2014-09-04T06:32:31Z (11 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
T. Sakamoto (AGU), J. Norris (BSU), S. D. Barthelmy (GSFC),
N. Gehrels (GSFC) report:
We report the spectral lag analysis for GRB 140903A (GCN Circ. 16764 & 16765)
based on the BAT data. Using 4-ms binned light curve, the spectral lag for
the 50-100 keV to 100-350 keV bands is 16 +- 7 ms, and 21 +- 7 ms for the 15-25 keV
to 50-100 keV bands. There is no evidence for extended emission. Those lag values
are consistent with the short end of the long-burst lag distribution. Although the
lag analysis suggests GRB 140903A is consistent with a long GRB population, a further
observation is needed to understand the nature of this burst.