GCN 44151: GRB 260330A: Fermi GBM Final Real-time Localization

2026-03-30T03:48:27.940Z | rev 0 | event: GRB 260330A

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

At 03:40:19 UT on 30 Mar 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260330A (trigger 796534824.63566 / 260330153).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 93.6, Dec = -44.6 (J2000 degrees, equivalent to J2000 06h 14m, -44d 36'), with a statistical uncertainty of 2.8 degrees.

The angle from the Fermi LAT boresight is 63.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260330153/quicklook/glg_skymap_all_bn260330153.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/bn260330153/quicklook/glg_healpix_all_bn260330153.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260330153/quicklook/glg_lc_medres34_bn260330153.gif