TITLE:   GCN CIRCULAR
NUMBER:  44300
SUBJECT: GRB 260415B: Fermi GBM Final Localization
DATE:    26/04/15 05:51:24 GMT
FROM:    Lorenzo Scotton at UAH <lscottongcn@outlook.com>

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

"At 02:25:33.80 UT on 15 April 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260415B (trigger 797912738/260415101).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 229.43, Dec = 24.94 (J2000 degrees, equivalent to J2000 15h 18m, +24d 56'),
with a statistical uncertainty of 9.03 degrees.

The angle from the Fermi LAT boresight is 41 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260415101/quicklook/glg_skymap_all_bn260415101.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/bn260415101/quicklook/glg_healpix_all_bn260415101.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260415101/quicklook/glg_lc_medres34_bn260415101.gif"