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/"
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