GCN Circular 39547
Subject
GRB 250228A: Fermi GBM Final Localization
Date
2025-03-02T09:43:31Z (13 days ago)
From
Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>
Via
Web form
The Fermi GBM team reports the detection of a likely SHORT GRB
"At 07:23:46.16 UT on 28 February 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250228A (trigger 762420231/250228308).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 94.90, Dec = -46.81 (J2000 degrees, equivalent to J2000 6h 19m, -46d 48'),
with a statistical uncertainty of 11.91 degrees.
The angle from the Fermi LAT boresight is 27 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250228308/quicklook/glg_skymap_all_bn250228308.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/bn250228308/quicklook/glg_healpix_all_bn250228308.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250228308/quicklook/glg_lc_medres34_bn250228308.gif"