[vsnet-grb-info 12851] GRB 130211A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14197
SUBJECT: GRB 130211A: Swift-BAT refined analysis
DATE:    13/02/11 13:32:29 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC),
S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), T. Sakamoto (AGU),
G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130211A (trigger #548276)
(Oates, et al., GCN Circ. 14195).  The BAT ground-calculated position is
RA, Dec = 147.524, -42.330 deg which is 
   RA(J2000)  =  09h 50m 05.7s 
   Dec(J2000) = -42d 19' 47.1" 
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 40%.
 
The mask-weighted light curve shows multiple, weak, overlapping peaks
starting at ~T-10 sec, peaking at ~T-2 sec, and ending at ~T+30 sec.
T90 (15-350 keV) is 25.1 +- 6.3 sec (estimated error including systematics).
 
The time-averaged spectrum from T-1.56 to T+32.00 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.81 +- 0.24.  The fluence in the 15-150 keV band is 6.4 +- 1.0 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-1.58 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/548276/BA/