[vsnet-grb-info 27380] GRB 210211A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29483
SUBJECT: GRB 210211A: Swift-BAT refined analysis 
DATE:    21/02/11 20:52:22 GMT
FROM:    Hans Krimm at NSF/NASA-GSFC  <hkrimm at nsf.gov>

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

Using the data set from T-240 to T+600 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 210211A (trigger #1032024)
(Troja, et al., GCN Circ. 29472).  The BAT ground-calculated position is
RA, Dec = 269.408, -46.270 deg which is 
  RA(J2000)  =  17h 57m 38.0s 
  Dec(J2000) = -46d 16' 11.0" 
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve shows a single broad peak starting at T-1 sec,
and decaying to background by T+8 sec.  T90 (15-350 keV) is 6.1 +- 0.6 sec 
(estimated error including systematics).

The time-averaged spectrum from T-0.70 to T+5.90 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.09 +- 0.16.  The fluence in the 15-150 keV band is 4.2 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+4.28 sec in the 15-150 keV band
is 1.0 +- 0.2 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/1032024/BA/