GCN Circular 39057
Subject
GRB 250128B: Fermi GBM Final Real-time Localization
Date
2025-01-28T16:33:27Z (13 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 16:22:53 UT on 28 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250128B (trigger 759774178.772694 / 250128683).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 264.8, Dec = -46.6 (J2000 degrees, equivalent to J2000 17h 39m, -46d 36'), with a statistical uncertainty of 8.2 degrees.
The angle from the Fermi LAT boresight is 145.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250128683/quicklook/glg_skymap_all_bn250128683.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/bn250128683/quicklook/glg_healpix_all_bn250128683.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250128683/quicklook/glg_lc_medres34_bn250128683.gif