GCN Circular 18648
Subject
GRB 151127A: Swift-BAT refined analysis
Date
2015-11-27T16:48:26Z (9 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
A. D'Ai (INAF-IASFPA), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
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-60 to T+243 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 151127A (trigger #665268)
(D'Ai, et al., GCN Circ. 18643). The BAT ground-calculated position is
RA, Dec = 19.664, -82.762 deg, which is
RA(J2000) = 01h 18m 39.4s
Dec(J2000) = -82d 45' 42.1"
with an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 96%.
The mask-weighted light curve shows a single spike starting at T_zero and
ending at ~T+0.25 sec. T90 (15-350 keV) is 0.19 +- 0.04 sec
(estimated error including systematics).
The time-averaged spectrum from T+0.016 to T+0.220 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.26 +- 0.33. The fluence in the 15-150 keV band is 2.3 +- 0.6 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band
is 0.4 +- 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/665268/BA/