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GCN Circular 19555

GRB 160623A: Fermi GBM detection/observation
2016-06-23T19:10:15Z (8 years ago)
Bagrat Mailyan at UAH <>
B. Mailyan (UAH), K. Toelge (MPE) and O. Roberts (UCD)
report on behalf of the Fermi GBM Team:

"At 05:00:34.23 UT on 23 June 2016, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 160623A (trigger 488350838 / 160623209 ),
which was also detected by the LAT (G. Vianello et al. 2016, GCN 19553)
and Konus-Wind (D. Frederiks et al. 2016, GCN 19554).
The GBM on-ground location is consistent with the LAT position.

The angle from the Fermi LAT boresight at the GBM trigger time is 83

The GRB was occulted by the Earth for a large part of its duration, and
the GBM trigger occurred ~50 s after the start of the GRB based on
the Konus-Wind lightcurve.
The GBM light curve consists of a single peak with a duration of about 50 s.
The time-averaged spectrum from T0-4.9 s to T0+32.8 s is
best fit by a power law function.  The power law index is -1.60 +/- 0.04.

The event fluence (10-1000 keV) in this time interval is
(5.598 +/- 0.369)E-06 erg/cm^2.

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