TITLE:   GCN CIRCULAR
NUMBER:  42249
SUBJECT: GRB 251014A: Fermi GBM Observation
DATE:    25/10/14 09:45:29 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

C. de Barra (University College Dublin), J. Smith (UAH), C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:

"At 00:28:30.34 UT on 14 October 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251014A (trigger 782094515/251014020).
which was also detected by Swift BAT (E. Ambrosi et al. 2025, GCN 42238).
The Fermi GBM on-ground location is consistent with the Swift BAT position.

The angle from the Fermi LAT boresight is 44 degrees.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 1.7 s (50-300 keV). The time-averaged spectrum
from T0-0.2 to T0+1.7 s is best fit by
a simple power law function with index -1.78 +/- 0.06.

The event fluence (10-1000 keV) in this time interval is
(6.2 +/- 0.5)E-07 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.32 s in the 10-1000 keV band is 6 +/- 1 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/"