GCN Circular 44279

E. Palafox (INAOE) and U. Pathak (IIT Bombay) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 06:13:46.17 UT on 12 April 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260412A (trigger 797667231/260412260).
which was also detected by SVOM/ECLAIRs (Wang et al. 2026, GCN 44276
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 ).
The Fermi GBM on-ground location is consistent with the SVOM/ECLAIRs position.

The angle from the Fermi LAT boresight is 35 degrees.

The GBM light curve consists of a bright emission episode with multiple peaks with a duration (T90)
of about 80 s (50-300 keV). The time-averaged spectrum
from T0-19 to T0+60 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.28 +/- 0.07 and the cutoff energy,
parameterized as Epeak, is 210 +/- 30 keV.

The event fluence (10-1000 keV) in this time interval is
(7.9 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+22 s in the 10-1000 keV band is 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/"