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GCN Circular 15820

Subject

GRB 140211A: Swift-BAT refined analysis

Date

2014-02-11T23:29:02Z (10 years ago)

From

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

J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+843 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 140211A (trigger #586289)
(Cummngs, et al., GCN Circ. 1816Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 124.233, 20.237 deg which is 
   RA(J2000)  =  08h 16m 56.0s 
   Dec(J2000) = +20d 14' 14.3" 
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 81%.
 
The mask-weighted light curve shows a single episode of emission starting
at ~T-30 sec, peaking at ~T=5 sec, and ending at ~T+135 sec.
T90 (15-350 keV) is 89.4 +- 18.7 sec (estimated error including systematics).
 
The time-averaged spectrum from T-16.84 to T+107.96 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.10 +- 0.14.  The fluence in the 15-150 keV band is 1.8 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.90 sec in the 15-150 keV band
is 0.7 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level. 
 
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/586289/BA/