TITLE:   GCN CIRCULAR
NUMBER:  8563
SUBJECT: GRB 081127: Swift-BAT refined analysis
DATE:    08/11/27 15:36:17 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>

M. Stamatikos (GSFC/ORAU), 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), J. Mao (INAF-OAB), C. B. Markwardt (GSFC/UMD),
D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS),
J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
 
Using the data set from T-119 to T+183 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 081127 (trigger #335715)
(Mao, et al., GCN Circ. 8560).  The BAT ground-calculated position is
RA, Dec = 332.075, 6.858 deg, which is 
   RA(J2000)  =  22h 08m 18.0s 
   Dec(J2000) = +06d 51' 30.2" 
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 51%.
 
The mask-weighted light curve shows a single peak starting at ~T-30 sec,
peaking around T+0 sec, and ending at ~T+55 sec.
T90 (15-350 keV) is 37 +- 10 sec (estimated error including systematics).
 
The time-averaged spectrum from T-31.2 to T+8.8 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.10 +- 0.35.  The fluence in the 15-150 keV band is 4.9 +- 1.0 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-1.19 sec in the 15-150 keV band
is 0.6 +- 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/335715/BA/