GCN Circular 32954
Subject
GRB 221119A: Fermi GBM detection
Date
2022-11-20T16:31:02Z (2 years ago)
From
Suraj Poolakkil at UAH <sp0076@uah.edu>
S. Poolakkil (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 15:02:53.64 UT on 19 November 2022, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 221119A (trigger 690562978 / 221119627)
which was also detected by the Fermi-LAT (Longo et al. 2022, GCN 32952).
The Fermi GBM Final Real-time Localization (GCN 32950) is consistent with
the LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 90
degrees.
The GBM light curve consists of multiple peaks followed
by some extended emission with a duration (T90) of about 66 s (50-300 keV).
The time-averaged spectrum from T0 s to T+74.75 s
is best fit by Band function, with Epeak = 132 +/- 11 keV,
alpha = -1.18 +/- 0.04 and beta = -1.97 +/- 0.04.
The event fluence (10-1000 keV) in this time interval is
(4.02 +/- 0.07)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+3.84 s in the 10-1000 keV band
is 18.0 +/- 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/"