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GCN Circular 18568

Subject

GRB 151107A, Swift-BAT refined analysis

Date

2015-11-08T17:04:20Z (8 years ago)

From

Amy Lien at GSFC <amy.y.lien@nasa.gov>

S. D. Barthelmy (GSFC),  J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/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 151107A (trigger #662757)
( Lien et al., GCN Circ. 18564Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 217.139, -59.680 deg which is
  RA(J2000)  =  14h 28m 33.4s
  Dec(J2000) = -59d -40' -46.9"
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve shows no obvious structure. The event starts
before the beginning of captured data at T-239 sec and extends out past the
end of collected event data at T+910 sec when the source location left the FoV
when the spacecraft slewed to a new target.

This burst occurred during the period of recovering the thermal control system
(Barthelmy et al., GCN Circ. 18562Not found
 
 
). The CZT bias voltage has been reduced
to -150v (instead of the normal -200v) and as such the energy scale is not fully
calibrated. Therefore, an accurate spectral analysis is unavailable.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/662757/BA/