GCN Circular 39548
Subject
GRB 250302A: Fermi GBM Final Real-time Localization
Date
2025-03-02T13:57:01Z (11 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 LONG GRB
At 13:46:32 UT on 2 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250302A (trigger 762615997.991246 / 250302574).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 236.4, Dec = 12.2 (J2000 degrees, equivalent to J2000 15h 45m, 12d 11'), with a statistical uncertainty of 5.4 degrees.
The angle from the Fermi LAT boresight is 67.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250302574/quicklook/glg_skymap_all_bn250302574.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/bn250302574/quicklook/glg_healpix_all_bn250302574.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250302574/quicklook/glg_lc_medres34_bn250302574.gif