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GCN Circular 28374

Subject
GRB 200906A: Fermi GBM detection
Date
2020-09-07T00:03:11Z (3 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
R. Hamburg (UAH), C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:


"At 13:11:53.38 UT on 06 September 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200906A (trigger 621090718 / 200906550)
which was also detected by the Swift/BAT and Swift/XRT (Page et al. 2020, GCN 28371).
The Fermi GBM Final Real-time Localization (GCN 28370) is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 74 degrees.

The GBM light curve shows two peaks
with a duration (T90) of about 67.3 s (50-300 keV), starting at  T0-49 s.
The time-averaged spectrum from T0-4.1 s to T0+16.4 s is
best fit by a Band function with Epeak = 50.5 +/- 9.9 keV,
alpha = -1.1 +/- 0.2 , and beta = -2.1 +/- 0.1

The event fluence (10-1000 keV) in this time interval is
(3.9 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.8 s in the 10-1000 keV band
is 4.5 +/- 0.2 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html

For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
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