GCN Circular 27109
Subject
GRB 200216B: Fermi GBM observation
Date
2020-02-16T23:24:33Z (4 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (NASA-MSFC/USRA), B. Mailyan (UAH) and C. Meegan (UAH),
report on behalf of the Fermi GBM Team:
"At 13:32:34.75 UT on 16 February 2020, the Fermi
Gamma-ray Burst Monitor (GBM)
triggered and located GRB 200216B (trigger 603552759 / 200216564),
which also triggered the Swift/BAT (D'Avanzo et al. 2020, GCN 27102).
The Fermi GBM Final Real-time Localization (GCN 27101)
is consistent with the Swift position.
The angle from the Fermi LAT boresight is 78 degrees.
The GBM light curve consists of a single bright pulse followed by
some extended emission with a duration (T90)
of about 12.0 s (10-1000 keV). The time-averaged spectrum
from T0-1.0 to T0+15.4 s is best fit by by a power law function
with an exponential high-energy cutoff.
The power law index is 0.07 +/- 0.30, and
the cutoff energy, parameterized as Epeak, is 69.5 +/- 4.9 keV.
The fluence (10-1000 keV) in this time interval
is (1.141 +/- 0.074)E-06 erg/cm^2.
The 1-sec peak photon flux measured starting from T0+2.3 s
in the 10-1000 keV band is 1.95 +/- 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/"