[vsnet-grb-info 25954] GRB 200701A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28054
SUBJECT: GRB 200701A: Swift-BAT refined analysis
DATE:    20/07/02 02:12:24 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

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

Using the data set from T-60 to T+243 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 200701A (trigger #980421)
(Bernardini et al., GCN Circ. 28052).  The BAT ground-calculated position is
RA, Dec = 123.563, -14.553 deg which is
   RA(J2000)  =  08h 14m 15.2s
   Dec(J2000) = -14d 33' 09.8"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 77%.

The mask-weighted light curve shows a single-pulse structure that
starts at ~T-7 s and peaks at ~T0. The main pulse ends at ~T+20 s,
followed by a weak tail that lasts till ~T+40 s. T90 (15-350 keV)
is 38.9 +- 8.6 sec (estimated error including systematics).

The time-averaged spectrum from T-6.81 to T+42.17 sec is best fit
by a simple power-law model.  The power law index of the time-averaged
spectrum is 1.91 +- 0.16.  The fluence in the 15-150 keV band
is 9.3 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured
from T-1.72 sec in the 15-150 keV band is 0.7 +- 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/980421/BA/