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GCN Circular 21297

GRB 170705A: Fermi GBM observation
2017-07-05T18:03:09Z (7 years ago)
Elisabetta Bissaldi at U.Innsbruk/IAPP <>
E. Bissaldi (Politecnico & INFN Bari) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 02:45:51.03 UT on 5 July 2017, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 170705A (trigger 520915556 / 170705115),
which was also detected by the Swift/BAT (Starling et al. 2017, GCN 21289).
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 118 

The GBM light curve shows two peaks
with a duration (T90) of about 22 s (50-300 keV).
The time-averaged spectrum from T0-2 s to T0+20 s is
adequately fit by a Band function with Epeak = 100 +/- 10  keV,
alpha = -0.88 +/- 0.07, and beta = -2.38 +/- 0.09.

The event fluence (10-1000 keV) in this time interval is
(1.37 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+9.4 s in the 10-1000 keV band
is 22.5 +/- 0.5 ph/s/cm^2.

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