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GCN Circular 33336

Subject
GRB 230216A: Swift-BAT refined analysis
Date
2023-02-17T19:01:37Z (a year ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
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
level.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/1154815/BA/


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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