GCN Circular 24520
Subject
GRB 190512A: Swift-BAT refined analysis
Date
2019-05-13T16:35:27Z (5 years ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
J. R. Cummings (CPI), S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB),
H. A. Krimm (NSF/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-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 190512A (trigger #903357)
(Bernardini, et al., GCN Circ. 24501). The BAT ground-calculated position is
RA, Dec = 82.402, -7.582 deg which is
RA(J2000) = 05h 29m 36.5s
Dec(J2000) = -07d 34' 56.1"
with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 83%.
The mask-weighted light curve shows a single FRED-shaped profile, starting at
T-12 sec, peaking close to T+0 sec, and slowly decaying to background by
T+50 sec. T90 (15-350 keV) is 40.1 +- 11.3 sec (estimated error including systematics).
The time-averaged spectrum from T-9.70 to T+43.31 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.07 +- 0.14. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-2.78 sec in the 15-150 keV band
is 1.0 +- 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/903357/BA/