Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 27266

GRB 200228B: Fermi GBM observation
2020-02-28T20:54:53Z (4 years ago)
Joshua Wood at MSFC/Fermi-GBM <>
E. Bissaldi (Politecnico and INFN Bari), C. Meegan (UAH), and J. Wood (NASA/MSFC)
report on behalf of the Fermi GBM Team:

"At 11:14:43.89 UT on 28 February 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200228B (trigger 604581288 / 200228469),
which was also detected by the Swift/BAT (Laha et al. 2020, GCN 27254).
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 59 degrees.

The GBM light curve shows a single emission episode
with a duration (T90) of about 14 s (50-300 keV).
The time-averaged spectrum from T0-4 s to T0+11 s is
adequately fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.17 +/- 0.33 and
the cutoff energy, parameterized as Epeak, is 76 +/- 16 keV.

The event fluence (10-1000 keV) in this time interval is
(1.30 +/- 0.18)E-07 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.3 s in the 10-1000 keV band
is 1.4 +/- 0.2 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 Page:"
Looking for U.S. government information and services? Visit