GCN Circular 23405
Subject
GRB 181103A: Swift-BAT refined analysis
Date
2018-11-03T13:47:23Z (6 years ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), A. Tohuvavohu (PSU),
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 181103A (trigger #870201)
(Tohuvavohu, et al., GCN Circ. 23402). The BAT ground-calculated position is
RA, Dec = 197.093, 52.220 deg which is
RA(J2000) = 13h 08m 22.3s
Dec(J2000) = +52d 13' 11.8"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 78%.
The mask-weighted light curves shows a single FRED-shaped peak from
T0-1 sec, peaking at T0, and decaying to background by T0+10 sec.
T90 (15-350 keV) is 8.38 +- 2.41 sec (estimated error including systematics).
The time-averaged spectrum from T-0.89 to T+10.18 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.90 +- 0.27. The fluence in the 15-150 keV band is 2.8 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.46 sec in the 15-150 keV band
is 0.8 +- 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/870201/BA/