TITLE:   GCN CIRCULAR
NUMBER:  43895
SUBJECT: GRB 260302A: Fermi GBM Final Real-time Localization
DATE:    26/03/02 14:30:12 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 14:19:40 UT on 2 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260302A (trigger 794153985.446798 / 260302597).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.3, Dec = -61.8 (J2000 degrees, equivalent to J2000 15h 57m, -61d 47'), with a statistical uncertainty of 2.7 degrees.

The angle from the Fermi LAT boresight is 20.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260302597/quicklook/glg_skymap_all_bn260302597.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260302597/quicklook/glg_healpix_all_bn260302597.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260302597/quicklook/glg_lc_medres34_bn260302597.gif