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GCN Circular 33336

GRB 230216A: Swift-BAT refined analysis
2023-02-17T19:01:37Z (a year ago)
Hans Krimm at NSF/NASA-GSFC <>
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII)
H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (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 230216A (trigger #1154815)
(Klingler, et al., GCN Circ. 33328).  The BAT ground-calculated position is
RA, Dec = 113.966, -7.993 deg which is
   RA(J2000)  =  07h 35m 51.9s
   Dec(J2000) = -07d 59' 36.2"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 85%.

The mask-weighted light curve shows a trio of peaks at approximately T-80 sec,
T-20 sec and T+0 sec, with some possible substructure and other, smaller
peaks. T90 (15-350 keV) is 91.20 +- 7.31 sec (estimated error including systematics).

The time-averaged spectrum from T-81.07 to T+16.40 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.90 +- 0.23.  The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.13 sec in the 15-150 keV band
is 1.2 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence

The results of the batgrbproduct analysis are available at

Dr. Hans A. Krimm, Program Officer
Divisional of Astronomical Sciences
National Science Foundation
2415 Eisenhower Avenue, Room W9158
Alexandria, VA  22314
Tel: 703-292-2761
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