GCN Circular 39692
Subject
GRB 250312B: Fermi GBM Final Localization
Date
2025-03-12T21:55:01Z (a day ago)
From
Lorenzo Scotton at UAH <lscottongcn@outlook.com>
Via
Web form
The Fermi GBM team reports the detection of a likely LONG GRB
"At 20:36:56.64 UT on 12 March 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250312B (trigger 763504621/250312859).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 180.86, Dec = -50.96 (J2000 degrees, equivalent to J2000 12h 3m, -50d 57'),
with a statistical uncertainty of 4.87 degrees.
The angle from the Fermi LAT boresight is 105 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250312859/quicklook/glg_skymap_all_bn250312859.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/bn250312859/quicklook/glg_healpix_all_bn250312859.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250312859/quicklook/glg_lc_medres34_bn250312859.gif"