TITLE: GCN CIRCULAR NUMBER: 32942 SUBJECT: GRB 221115A: Fermi GBM detection DATE: 22/11/16 15:43:45 GMT FROM: Peter Veres at UAH 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). 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/"