[vsnet-grb-info 20038] GRB 171115A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22127
SUBJECT: GRB 171115A: Swift-BAT refined analysis
DATE:    17/11/16 04:11:47 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

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

Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 171115A (trigger #790053)
(Sbarufatti et al., GCN Circ. 22124).  The BAT ground-calculated position is
RA, Dec = 278.392, 9.118 deg which is
  RA(J2000)  =  18h 33m 34.2s
  Dec(J2000) = +09d 07' 06.4"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve shows a weak pulse that starts at ~T-7 s,
peaks at ~T-1 s, and ends at ~T+35 s. T90 (15-350 keV) is 38.2 +- 3.4 sec
(estimated error including systematics).

The time-averaged spectrum from T-7.38 to T+34.78 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.76 +- 0.18.  The fluence in the 15-150 keV band is 6.9 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-2.32 sec in the 15-150 keV band
is 0.6 +- 0.1 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/790053/BA/