[vsnet-grb-info 8824] GRB 100111A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10322
SUBJECT: GRB 100111A: Swift-BAT refined analysis
DATE:    10/01/11 20:16:16 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU),
L. Vetere (PSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 100111A (trigger #382399)
(Vetere, et al., GCN Circ. 10317).  The BAT ground-calculated position is
RA, Dec = 247.029, 15.539 deg which is 
   RA(J2000)  =  16h 28m 06.9s 
   Dec(J2000) = +15d 32' 19.1" 
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
 
The mask-weighted light curve shows a weak peak at ~T-30 sec and the main
FRED-like peak from ~T-10 sec and ending at ~T+25 sec.  T90 (15-350 keV)
is 12.9 +- 2.1 sec (estimated error including systematics).
 
The time-averaged spectrum from T-7.5 to T+8.7 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.69 +- 0.13.  The fluence in the 15-150 keV band is 6.7 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.03 sec in the 15-150 keV band
is 1.9 +- 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/382399/BA/