[vsnet-grb-info 9947] GRB 101114A, Swift-BAT GRB detected by ground processing

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11405
SUBJECT: GRB 101114A, Swift-BAT GRB detected by ground processing
DATE:    10/11/15 00:08:33 GMT
FROM:    Takanori Sakamoto at NASA/GSFC  <takanori.sakamoto-1 at nasa.gov>

T. Sakamoto (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
 
Based on the ground data processing, we found the GRB 101114A (trigger=438392) 
at T0=00:32:50 UT.  The BAT onboard analysis of the trigger was prematurely 
terminated by a slew to a different target.  We have only limited event-by-event 
data on the ground for this trigger.

Using the data set from T0 to T0+4.1 sec,  the BAT ground-calculated position 
in the 15-200 keV band is RA, Dec = 303.193, 14.029 deg which is 
   RA(J2000)  =  20h 12m 46.3s 
   Dec(J2000) = +14d 01' 44.4" 
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The image significance is 13.6 sigma.  The partial coding was 30%.  
 
The mask-weighted light curve shows a sigle FRED-like spike starting before 
T0, peaking at T0+2 sec and ending after T0+10sec.  Because of the incomplete data 
(the event data are only available from T0 to T0+10 sec), we can only state 
that the duration of the burst is >10 sec.  

The time-averaged spectrum from T0 to T0+10 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.29 +- 0.17.  The fluence in the 15-150 keV band is 8.0 +- 0.8 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+2.00 sec in the 15-150 keV band
is 1.8 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level. 
 
A Swift TOO is being done to get an XRT position.