GCN Circular 41102

O. Mukherjee (USRA) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 01:29:06.25 UT on 16 July 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250716A (trigger 774322151/250716062).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 65.72, Dec = -48.56 (J2000 degrees, equivalent to
J2000 4h 22m, -48d 33'), with a statistical uncertainty of 1.00 degrees.
(radius, 1-sigma containment, statistical only; there is additionally a
systematic error which we have characterized as a mixture of two Gaussians,
one with a radius of 1.8 degrees (52% contribution) and one with a radius
of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).

The angle from the Fermi LAT boresight is 126 degrees.

The GBM light curve consists of two pulses with a duration (T90)
of about 66 s (50-300 keV). The time-averaged spectrum
from T0-3.1 to T0+79.9 s is best fit by
a Band function with Epeak = 1153 +/- 133 keV,
alpha = -1.29 +/- 0.01, and beta = -1.89 +/- 0.03.

The event fluence (10-1000 keV) in this time interval is
(9.9 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+5.5 s in the 10-1000 keV band is 37.9 +/- 0.7 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/"