[vsnet-grb-info 27306] GRB 210205A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29409
SUBJECT: GRB 210205A: Swift-BAT refined analysis
DATE:    21/02/06 03:36:38 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
S. Dichiara (NASA/GSFC/UMCP), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

Using the data set from T-239 to T+963 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 210205A (trigger #1030629)
(Dichiara et al., GCN Circ. 29397).  The BAT ground-calculated position is
RA, Dec = 347.264, 56.311 deg which is
   RA(J2000)  =  23h 09m 03.3s
   Dec(J2000) = +56d 18' 41.2"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 18%.

The mask-weighted light curve shows a multi-peaked structure that
starts at ~ T-7 s and ends at ~T+20 s. The main peak in the structure
occurs at ~T+6 s. T90 (15-350 keV) is 22.70 +- 4.18 sec (estimated
error including systematics).

The time-averaged spectrum from T-7.35 to T+20.07 sec is best fit
by a simple power-law model.  The power law index of the time-averaged
spectrum is 2.27 +- 0.31.  The fluence in the 15-150 keV band is
8.7 +- 1.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from
T+5.98 sec in the 15-150 keV band is 1.6 +- 0.5 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/1030629/BA/