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GCN Circular 31717

GRB 220309A: Fermi GBM Final Real-time Localization
2022-03-09T06:15:02Z (2 years ago)
Fermi GBM Team at MSFC/Fermi-GBM <>
The Fermi GBM team reports the detection of a likely LONG GRB

At 06:04:43 UT on 9 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220309A (trigger 668498688.984364 / 220309253).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 147.0, Dec = -0.6 (J2000 degrees, equivalent to J2000 09h 48m, 0d 36'), with a statistical uncertainty of 11.5 degrees.

The angle from the Fermi LAT boresight is 59.0 degrees.

The skymap can be found here:

The HEALPix FITS file, including the estimated localization systematic, can be found here:

The GBM light curve can be found here:
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