GCN Circular 32942

P. Veres and C. Meegan (both UAH)
report on behalf of the Fermi GBM Team:

"At 00:25:28.80 UT on 15 November 2022, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 221115A (trigger 690164733 / 221115018)
which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. GCN 32940
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 ).

The on-ground calculated location, using the GBM trigger data, is RA =
37.7, DEC = -3.1 (J2000 degrees, equivalent to 02 h 31 m, -03 d 06 '),
with a statistical uncertainty of 2.1 degrees (radius, 1-sigma
containment, statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90%
of GRBs having a 3.7 deg error and a small tail suffering a larger
than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32]
).

The angle from the Fermi LAT boresight at the GBM trigger time is 84 degrees.



The GBM light curve consists of two emission episodes with a duration
(T90) of about 147 s (50-300 keV). The time-averaged spectrum from
T0-12.5 s to T0+151.3 s is best fit by
a power law function with an exponential high-energy cutoff.  The
power law index is -0.83 +/- 0.08 and the cutoff energy, parameterized
as Epeak, is 283 +/- 30 keV.


The event fluence (10-1000 keV) in this time interval is (2.26 +/-
0.12)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from
T0+32.1 s in the 10-1000 keV band is 3.50 +/- 0.24 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/"