[vsnet-grb-info 9387] GRB 100619A: Fermi GBM detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10868
SUBJECT: GRB 100619A: Fermi GBM detection
DATE:    10/06/20 14:52:19 GMT
FROM:    Narayana Bhat at U Alabama/Huntsville/GBM  <Narayana.Bhat at nasa.gov>

P. N. Bhat (UAH) 
reports on behalf of the Fermi GBM Team:

"At 03:55:23.71 UT on 19 June 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100619A (trigger 298612525 / 100619015).
which was also detected by the SWIFT-BAT (Cannizzo et al. 2008, GCN 10863)
The GBM on-ground location is consistent with the Swift position.
 
The angle from the Fermi LAT boresight is 117 degrees.

The GBM light curve shows 2 well separated pulses
with a duration (T90) of about 96.8 s (50-300 keV).
The time-averaged spectrum from T0-9.216 s to T0+101.378 s is
well fit by a power law function with an exponential
high energy cutoff.  The power law index is -1.61 +/- 0.05 and
the cutoff energy, parameterized as Epeak, is 143.2 +/- 24.8 keV

(C-stat 419 for 241 d.o.f.).

The event fluence (8-1000 keV) in this time interval is
(1.71 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+83 s in the 10-1000 keV band is 1.88 +/- 0.04 ph/s/cm^2.

A Band function fits the spectrum equally well (C-stat 419 for 240 d.o.f.)
with Epeak= 135.3 +/- 37.1 keV, alpha = -1.60 +/- 0.07 and beta = -2.36 +/-
0.69. 


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