GCN Circular 22727
Subject
GRB 180514A: Swift-BAT refined analysis
Date
2018-05-14T21:14:51Z (6 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), S. J. LaPorte (PSU),
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-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 180514A (trigger #832368)
(LaPorte et al., GCN Circ. 22723). The BAT ground-calculated position is
RA, Dec = 197.382, 36.970 deg which is
RA(J2000) = 13h 09m 31.7s
Dec(J2000) = +36d 58' 13.0"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 91%.
The mask-weighted light curve shows a weak pulse that starts at ~T-8 s,
peaks at ~T0, and ends at ~T+55 s. T90 (15-350 keV) is 46.9 +- 14.5 sec
(estimated error including systematics).
The time-averaged spectrum from T-8.33 to T+54.71 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.77 +- 0.14. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.23 sec in the 15-150 keV band
is 0.7 +- 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/832368/BA/