GCN Circular 45138

M. Dafcikova (MUNI) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 12:58:43.52 UT on 10 July 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260710A (trigger 805381128/260710541).
The Final real-time localization was reported in GCN 45131
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 .

The GBM light curve consists of a single peak with a duration (T90)
of about 1.9 s (50-300 keV). The time-averaged spectrum
from T0-0.16 to T0+1.94 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.93 +/- 0.03 and the cutoff energy,
parameterized as Epeak, is 139 +/- 3 keV.

The event fluence (10-1000 keV) in this time interval is
(2.17 +/- 0.09)E-06 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.38 s in the 10-1000 keV band is 30 +/- 3 ph/s/cm^2.

A Band function fits the spectrum equally well
with Epeak= 98 +/- 3 keV, alpha = -0.71 +/- 0.02 and beta = -2.00 +/- 0.07.

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/"