GCN Circular 39357
Subject
GRB 250217C: Fermi GBM Final Real-time Localization
Date
2025-02-18T00:05:15Z (5 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 23:54:41 UT on 17 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250217C (trigger 761529286.801804 / 250217996).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 131.6, Dec = 32.9 (J2000 degrees, equivalent to J2000 08h 46m, 32d 53'), with a statistical uncertainty of 5.5 degrees.
The angle from the Fermi LAT boresight is 100.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250217996/quicklook/glg_skymap_all_bn250217996.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/bn250217996/quicklook/glg_healpix_all_bn250217996.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250217996/quicklook/glg_lc_medres34_bn250217996.gif