TITLE:   GCN CIRCULAR
NUMBER:  32786
SUBJECT: GRB 221016A: Swift-BAT refined analysis
DATE:    22/10/17 20:42:14 GMT
FROM:    Tyler Parsotan at UMBC/GSFC/CRESST II  <parsotat@umbc.edu>

S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), 

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+200 sec from the recent telemetry downlink,

we report further analysis of BAT GRB 221016A (trigger #1129775)

(Page, et al., GCN Circ. 32774).  The BAT ground-calculated position is

RA, Dec = 38.938, -34.615 deg which is 

   RA(J2000)  =  02h 35m 45.2s 

   Dec(J2000) = -34d 36' 54.2" 

with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).

The partial coding was 53%.

 

The light curve shows a single peaked pulse. T90 (15-350 keV) is 21.86 +- 5.70 sec 

(estimated error including systematics).

 

The time-averaged spectrum from T-3.18 to T+29.18 sec is best fit by a simple

power-law model.  The power law index of the time-averaged spectrum is

1.28 +- 0.08.  The fluence in the 15-150 keV band is 2.3 +- 0.1 x 10^-06 erg/cm2.

The 1-sec peak photon flux measured from T+0.03 sec in the 15-150 keV band

is 3.4 +- 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/1129775/BA/