GCN Circular 43895
Subject
GRB 260302A: Fermi GBM Final Real-time Localization
Event
Date
2026-03-02T14:30:12Z (4 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 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