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GCN Circular 31760

Subject
GRB 220311A: Fermi GBM observation
Date
2022-03-15T14:57:05Z (2 years ago)
From
Rachel Hamburg at UAH <rkh0007@uah.edu>
R. Hamburg (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 16:33:18.40 UT on 11 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 220311A (trigger 668709203 / 220311690), which
was also detected by the INTEGRAL/IBAS (Mereghetti et al. 2022, GCN 31740).
The Fermi GBM Final Real-time Localization (GCN 31744) is largely
consistent with the INTEGRAL position.

The angle from the Fermi LAT boresight at the GBM trigger time is 111
degrees.

The GBM light curve shows a single spike with a duration (T90) of about
10 s (50-300 keV). The time-averaged spectrum from
T0-5.1 s to T0+0.0 s is adequately a simple power law function with index
-1.55 +/- 0.11.

The event fluence (10-1000 keV) in this time interval is
(1.8 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-4.7 s in the 10-1000 keV band
is 1.8 +/- 0.3 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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