TITLE:   GCN CIRCULAR
NUMBER:  35476
SUBJECT: GRB 240102A: Swift-BAT refined analysis
DATE:    24/01/03 23:33:27 GMT
FROM:    Amy <yarleen@gmail.com>

M. J. Moss (GSFC), S. D. Barthelmy (GSFC),
J.D. Gropp (PSU), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC), T. Sakamoto (AGU),
M. Stamatikos (OSU) (i.e. the Swift-BAT team):

Using the data set from T-60 to T+243 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 240102A (trigger #1205899)
(Gropp et al., GCN Circ. 35461).  The BAT ground-calculated position is
RA, Dec = 96.848, -20.011 deg which is
   RA(J2000)  =  06h 27m 23.5s
   Dec(J2000) = -20d 00' 39.0"
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve show some weak emission that starts at ~T+8 s
and ends at ~T+140 s. T90 (15-350 keV) is 119.00 +- 30.59 sec
(estimated error including systematics).

The time-averaged spectrum from T+8.00 to T+142.00 sec is best fit by a
simple
power-law model.  The power law index of the time-averaged spectrum is
2.00 +- 0.22.  The fluence in the 15-150 keV band is 8.5 +- 1.3 x 10^-7
erg/cm2.
The 1-sec peak photon flux measured from T+65.00 sec in the 15-150 keV band
is 0.4 +- 0.1 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/1205899/BA/