[vsnet-grb-info 12502] GRB 121014A: Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13869
SUBJECT: GRB 121014A: Swift-BAT refined analysis
DATE:    12/10/15 10:52:56 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU),
J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-60 to T+222 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 121014A (trigger #535960)
(Lien, et al., GCN Circ. 13867).  The BAT ground-calculated position is
RA, Dec = 166.645, -29.105 deg, which is 
   RA(J2000)  =  11h 06m 34.7s 
   Dec(J2000) = -29d 06' 18.3" 
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 72%.
 
The mask-weighted light curve shows 3 main peaks starting at ~T-0.2 sec,
peaking at ~T+0.4, ~T+19, & ~T+50 sec, resp., and ending at ~T+90 sec.
T90 (15-350 keV) is 80.0 +- 22.6 sec (estimated error including systematics).
 
The time-averaged spectrum from T-12.21 to T+67.79 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.91 +- 0.17.  The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+59.29 sec in the 15-150 keV band
is 0.3 +- 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/535960/BA/