GCN Circular 42309
Subject
GRB 251016A: Fermi GBM Final Localization
Event
Date
2025-10-16T15:46:56Z (4 days ago)
From
Jacob Smith at Fermi-GBM Team <jrs0118@uah.edu>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 14:59:19.76 UT on 16 October 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 251016A (trigger 782319564/251016625).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 268.93, Dec = -48.82 (J2000 degrees, equivalent to J2000 17h 55m, -48d 49'),
with a statistical uncertainty of 3.55 degrees.
The angle from the Fermi LAT boresight is 33 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251016625/quicklook/glg_skymap_all_bn251016625.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251016625/quicklook/glg_healpix_all_bn251016625.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251016625/quicklook/glg_lc_medres34_bn251016625.gif"