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GCN Circular 34886

Subject
GRB 231025A: Fermi GBM Observation
Date
2023-10-25T21:04:53Z (7 months ago)
From
Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>
Via
Web form
J.Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 06:46:59.59 UT on 25 October 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 231025A (trigger 719909224/231025283).
which was also detected by Swift/BAT-GUANO (Ronchini et al. 2023, GCN 34884).
The Fermi GBM Final Real-time Localization is reported in GCN 34883.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 6 s (50-300 keV). The time-averaged spectrum
from T0-2.0 to T0+4.1 s is best fit by a simple power law function with index -1.4 +/- 0.1.

The event fluence (10-1000 keV) in this time interval is
(1.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-3.1 s in the 10-1000 keV band is 1.3 +/- 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/"
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