GCN Circular 13942
Subject
GRB 121102A: Swift-BAT refined analysis
Date
2012-11-02T12:13:27Z (12 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
V. D'Elia (ASDC), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), 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-61 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 121102A (trigger #537266)
(D'Elia, et al., GCN Circ. 13938). The BAT ground-calculated position is
RA, Dec = 270.896, -16.951 deg, which is
RA(J2000) = 18h 03m 35.1s
Dec(J2000) = -16d 57' 03.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a FED peak starting at ~T-0.2 sec,
peaking at ~T+6 sec, and ending at ~T+95 sec. T90 (15-350 keV) is
24.7 +- 3.4 sec (estimated error including systematics).
The time-averaged spectrum from T-0.30 to T+35.25 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.88 +- 0.07. The fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+5.68 sec in the 15-150 keV band
is 2.3 +- 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/537266/BA/