GCN Circular 4260
Subject
GRB 051111: Swift-BAT refined analysis
Date
2005-11-11T15:08:54Z (18 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori@milkyway.gsfc.nasa.gov>
H. Krimm (GSFC/USRA), M. Ajello (MPE), L. Barbier (GSFC),
S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL),
R. Fink (GSFC), N. Gehrels (GSFC), D. Hullinger (UMD),
C. Markwardt (GSFC/UMD),D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
Using the data set from T-300 to T+300 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 051111
(trigger #163438) (Sakamoto, et al., GCN 4248).
The BAT ground-calculated position is
(RA,Dec) = 348.134, +18.365 {23h 12m 32s, 18d 21' 54"} [deg; J2000]
+- 0.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 59%.
The light curve has a FRED-like structure with the duration of
the rising and the decay part of 10 sec and 40 sec, respectively.
The emission might be extended untill T+80 sec. Although there is
a bump around T+5s in the 100-350 keV band, this bump is not visible
below 100 keV. T90 (15-350 keV) is (47 +- 1) sec
(estimated error including systematics).
The power law index of the time-averaged spectrum is 1.32 +- 0.06.
The fluence in the 15-150 keV band is (3.9 +- 0.1) x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.56 sec in the 15-150 keV
band is (2.5 +- 0.2) ph/cm2/sec. All the quoted errors are at the 90%
confidence level.