GCN Circular 15669
Subject
GRB 140102A: Fermi/GBM Observation
Date
2014-01-03T16:46:14Z (10 years ago)
From
Binbin Zhang at UAH <binbin.zhang@uah.edu>
Bin-Bin Zhang and Narayana Bhat (UAH/CSPAR) report on behalf of the Fermi GBM Team:
"At 21:17:37.81 UT on January 02 2014, the Fermi Gamma-Ray
Burst Monitor triggered and located GRB 140102A (trigger 410390260/
140102887). This GRB also triggered Swift (Hagen et al. GCN 15653) and
Konus-Wind (Golenetskii et al, GCN 15667) and was detected by Fermi/LAT
(Sonbas et al. GCN 15659) and in several ground follow-up observations
(Xu et al GCN 15655; Gorosabel et al, GCN 15658; Kimura et al, GCN 15663
and Tanga et al, 15665). The GBM on-ground calculated location is consistent
with the Swift/XRT position and those obtained with follow-up observations.
The trigger resulted in an Autonomous Repoint Request (ARR) that was
accepted and the spacecraft slewed to the GBM in-flight location. The
initial angle from the LAT boresight was 47 deg from the Fermi/GBM
position.
The GBM light curve consists of two major bright overlapping peaks. The
duration (T90) of the burst was about 3.6 s (50-300 keV). The time-averaged
spectrum from T0+0.4 s to T0+4 s is best fit with a Band function with
Epeak = 186 +/- 5 keV, alpha = -0.71 +/- 0.02 and beta = -2.49 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(1.78 +/- 0.03)E-05 erg/cm^2. The 1.0-sec peak photon flux measured
starting from T0+1.98 s in the 10-1000 keV band is 49.7 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."