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GCN Circular 30210

GRB 210606A: Fermi GBM detection
2021-06-11T20:58:26Z (3 years ago)
Suraj Poolakkil at UAH <>
S. Poolakkil (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 03:56:02.12 UT on 6 June 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 210606A (trigger 644644567 / 210606164)
which was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2021, GCN
The Fermi GBM Final Real-time Localization (GCN 30131) is consistent with
the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 108

The GBM light curve consists of a single peak followed by some
extended emission with a duration (T90) of about 11 s (50-300 keV).
The time-averaged spectrum from T0-4.09 s to T0-1.02 s
is best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.99 +/- 0.22  and
the cutoff energy, parameterized as Epeak, is 195 +/- 62 keV.

The event fluence (10-1000 keV) in this time interval is
(0.845 +/- 0.144)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-2.05 s in the 10-1000 keV band
is 2.5 +/- 0.3 ph/s/cm^2.

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

For Fermi GBM data and info, please visit the official Fermi GBM Support
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