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GCN Circular 32918

GRB 221107A: Fermi GBM Observation
2022-11-08T14:30:30Z (2 years ago)
Rachel Dunwoody at UCD <>
R. Dunwoody (UCD), R. Hamburg (UAH) and C. Meegan (UAH), report on behalf
of the Fermi GBM Team:

"At 01:22:52.46 UT on 07 November 2022, the Fermi Gamma-ray Burst Monitor
(GBM) triggered and located GRB 221107A (trigger 689476977 / 221107058.
This event was also observed by Swift/BAT-GUANO (GCN 32915) and GRBAlpha
(GCN 32917).

The GBM position is reported in the Fermi-GBM Final on-ground Localization
(GCN 32913). The angle from the Fermi LAT boresight is 54 degrees.

The GBM light curve shows numerous peaks with a duration (T90) of about 231
s (50-300 keV). The time-averaged spectrum from T0-2 to T0+235 s is best
fit by a Band function with Epeak = 47 +/- 2 keV, alpha = 0.32 +/- 0.17,
and beta = -2.00 +/- 0.02.

The event fluence (10-1000 keV) in this time interval is (7.464 +/-
0.261)E-05 erg/cm2. The 1-sec peak photon flux measured starting from
T0+9.5 s in the 10-1000 keV band is 10.3 +/- 0.4 ph/s/cm2.

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 Page:"
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