GRB 181224***A***, Swift-BAT refined analysis
 
<somebody goes first>
<add the BA alphabetically>
S. D. Barthelmy (GSFC), 
J. R. Cummings (CPI),
H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC),
D. M. Palmer (LANL),
T. Sakamoto (AGU),
M. Stamatikos (OSU),
T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+450 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 181224***A*** (trigger #878911)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 125.949, 6.194 deg which is 
   RA(J2000)  =  08h 23m 47.7s 
   Dec(J2000) = +06d 11' 40.0" 
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 80%.
 
[Description about the mask-weighted light curve]
T90 (15-350 keV) is 12.5 +- 4.2 sec (estimated error including systematics).
 
The time-averaged spectrum from T-12.0 to T+3.3 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.27 +- 0.20.  The fluence in the 15-150 keV band is 4.9 +- 0.6 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+0.48 sec in the 15-150 keV band
is 1.0 +- 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/878911/BA/