GCN Circular 43400

E. Bissaldi (Politecnico and INFN Bari)
reports on behalf of the Fermi GBM Team:


"At 11:40:26.31 UT on 14 January 2026, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 260114A (trigger 790083631 / 260114486),
which was also detected by the Swift/BAT (Eyles-Ferris et al. 2026, GCN 43396
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 ).
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 70 degrees.

The GBM light curve consists of a bright emission episode
with a duration (T90) of about 320 ms (50-300 keV).
The time-averaged spectrum from T0-0.064 s to T0+0.384 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.07 +/- 0.06 and
the cutoff energy, parameterized as Epeak, is 583 +/- 25 keV.

The event fluence (10-1000 keV) in this time interval is
(4.87 +/- 0.12)E-06 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.064 s in the 10-1000 keV band
is 35.9 +/- 1.4 ph/s/cm^2.

A Band function fits the spectrum equally well 
with Epeak = 575 +/- 29 keV, alpha = -0.06 +/- 0.06, and beta = -3.5 +/- 0.6.


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/"