[vsnet-grb-info 14789] GRB 140412A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16103
SUBJECT: GRB 140412A: Swift-BAT refined analysis
DATE:    14/04/13 14:22:16 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 140412A (trigger #595608)
(D'Elia, et al., GCN Circ. 16097).  The BAT ground-calculated position is
RA, Dec = 145.032, -65.826 deg, which is 
   RA(J2000)  =  09h 40m 07.6s 
   Dec(J2000) = -65d 49' 33.7" 
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 77%.
 
The mask-weighted light curve shows two peaks strting at ~T-35 sec,
peaking at ~T+1 sec, and ending at ~T+35 sec.
T90 (15-350 keV) is 39.6 +- 8.2 sec (estimated error including systematics).
 
The time-averaged spectrum from T-36.94 to T+12.18 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.95 +- 0.19.  The fluence in the 15-150 keV band is 7.2 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band
is 1.1 +- 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/595608/BA/