GCN Circular 33755
Subject
GRB 230506C: Fermi GBM detection
Date
2023-05-10T17:37:35Z (a year 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 17:09:16.97 UT on 6 May 2023, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 230506C (trigger 705085761 / 230506715)
which was also detected by the Swift/BAT (Tohuvavohu et al. 2023, GCN 33731).
The angle from the Fermi LAT boresight at the GBM trigger time is 15 degrees.
The GBM light curve consists of a single peak followed
by some extended emission with a duration (T90) of about 23 s (50-300 keV).
The time-averaged spectrum from T0-6.1 s to T0+11.3 s
is best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.19 +/- 0.11 and
the cutoff energy, parameterized as Epeak, is 163 +/- 30 keV.
The event fluence (10-1000 keV) in this time interval is
(3.1 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+3.0 s in the 10-1000 keV band
is 3.3 +/- 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/"