[vsnet-grb-info 12206] GRB 120728A: Fermi GBM observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13595
SUBJECT: GRB 120728A: Fermi GBM observation
DATE:    12/08/06 17:24:10 GMT
FROM:    Shaolin Xiong at UAH  <sx0002 at uah.edu>

Shaolin Xiong (UAH) reports on behalf of the Fermi GBM Team:

"At 22:25:13.737 UT on 28 July 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 120728A (trigger 365207115 / 120728934)
which was also detected by the Swift/BAT (Cummings et al. 2012, GCN 13525).
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight is 110 degrees.

The GBM light curve consists of multiple pulses
with a duration (T90) of about 32.8 s (50-300 keV).
The time-averaged spectrum from T0-1.0 s to T0+23.6 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -1.66 +/- 0.10 and
the cutoff energy, parameterized as Epeak, is 119.80 +/- 30.80 keV.

The event fluence (10-1000 keV) in this time interval is
(5.29 +/- 0.27)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+13.12 s in the 10-1000 keV band
is 3.58 +/- 0.28 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."