TITLE:   GCN CIRCULAR
NUMBER:  5777
SUBJECT: GRB 061102, Swift-BAT refined analysis
DATE:    06/11/02 04:39:10 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>

GRB 061102, Swift-BAT refined analysis
 
J. Tueller (GSFC), L. Barbier (GSFC), S. D. Barthelmy (GSFC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
S.T. Holland (GSFC/USRA), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU)
on behalf of the Swift-BAT team:
 
Using the data set from T-120 to T+182 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 061102 (trigger #236430)
(Holland, et al., GCN Circ. 5776).  The BAT ground-calculated position
is RA,Dec = 148.393, -17.000 deg {9h 53m 34.2s, -17d 0' 0.8"} (J2000)
+- 2.7 arcmin, (radius, sys+stat, 90% containment).  The partial coding was 100%.
 
The mask-weighted lightcurve shows a FRED starting at T+0 and ending 
about T+50 sec.  T90 (15-350 keV) is 17.6 +- 1 sec (estimated error
including systematics).
 
The time-averaged spectrum from T-1.0 to T+18.9 is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.45 +- 0.33.  The fluence in the 15-150 keV band is 1.9 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+3.37 sec in the 15-150 keV band
is 0.2 +- 0.1 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level.