TITLE: GCN CIRCULAR NUMBER: 41102 SUBJECT: GRB 250716A: Fermi GBM Observation DATE: 25/07/16 15:35:42 GMT FROM: oindabimukherjee@gmail.com
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/"
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