TITLE:   GCN CIRCULAR
NUMBER:  26418
SUBJECT: GRB 191213A: Swift-BAT refined analysis
DATE:    19/12/14 03:08:22 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien@nasa.gov>

A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
S. B. Cenko (GSFC), J. R. Cummings (CPI),
H. A. Krimm (NSF), S. Laha (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-239 to T+963 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 191213A (trigger #944091)
(Cenko et al., GCN Circ. 26398).  The BAT ground-calculated position is
RA, Dec = 224.530, -9.745 deg which is
   RA(J2000)  =  14h 58m 07.2s
   Dec(J2000) = -09d 44' 41.9"
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 56%.

The mask-weighted light curve shows some weak emission that starts at ~T-30
s
and remains detectable until the burst went out of the BAT FOV at T+139 s.
It is likely that the emission continues beyond T+139 s. The burst did not
come
back into the BAT FOV within the next ~ 2 hours.

The time-averaged spectrum from T-33.52 to T+104.01 sec is best fit by a
simple
power-law model.  The power law index of the time-averaged spectrum is
1.49 +- 0.16.  The fluence in the 15-150 keV band is 2.1 +- 0.2 x 10^-6
erg/cm2.
The 1-sec peak photon flux measured from T+99.95 sec in the 15-150 keV band
is 0.5 +- 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/944091/BA/