GCN Circular 37753

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

Using the data set from T-240 to T+963 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 241006A (trigger #1258721;
Gupta et al., GCN Circ. 37722
Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 304.782, -40.806 deg which is
   RA(J2000)  =  20h 19m 07.6s
   Dec(J2000) = -40d 48' 21.7"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The
partial coding was 65%.

The mask-weighted light curve shows a single-pulse structure that starts at
~T-7 s, peaks at ~T+10 s, and ends at ~T+50 s. T90 (15-350 keV) is 47.95 +-
9.72 sec (estimated error including systematics).

The time-averaged spectrum from T-7.14 to T+47.82 sec is best fit by a
simple power-law model.  The power law index of the time-averaged spectrum
is 1.52 +- 0.19.  The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-06
erg/cm2. The 1-sec peak photon flux measured from T+9.95 sec in the 15-150
keV band is 0.6 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90%
confidence
level.

The results of the batgrbproduct analysis are available at
https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1258721