TITLE:   GCN CIRCULAR
NUMBER:  30979
SUBJECT: GRB 211023B: Swift-BAT refined analysis
DATE:    21/10/24 20:56:12 GMT
FROM:    Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>

S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), S. Dichiara (NASA/GSFC/UMCP),
H. A. Krimm (NSF), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),
M. Stamatikos (OSU) (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 211023B (trigger #1080859)
(Dichiara, et al., GCN Circ. 30960).  The BAT ground-calculated position is
RA, Dec = 170.314, 39.133 deg which is 
  RA(J2000)  =  11h 21m 15.3s 
  Dec(J2000) = +39d 07' 58.7" 
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 48%.

The mask-weighted light curves shows a single peak from approximately T+0
to T+1.5 seconds.   T90 (15-350 keV) is 1.30 +- 0.26 sec (estimated error including 
systematics).

The time-averaged spectrum from T-0.01 to T+1.45 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.97 +- 0.24.  The fluence in the 15-150 keV band is 1.7 +- 0.3 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.24 sec in the 15-150 keV band
is 2.2 +- 0.3 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/1080859/BA/