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