TITLE:   GCN CIRCULAR
NUMBER:  43780
SUBJECT: GRB 260217A: Fermi GBM Final Localization
DATE:    26/02/18 11:43:01 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

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

At 09:18:12.01 UT on 17 February 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260217A (trigger 793012697/260217388).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 278.43, Dec = -5.30 (J2000 degrees, equivalent to J2000 18h 34m, -5d 18'),
with a statistical uncertainty of 11.59 degrees.

The angle from the Fermi LAT boresight is 91 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260217388/quicklook/glg_skymap_all_bn260217388.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/bn260217388/quicklook/glg_healpix_all_bn260217388.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260217388/quicklook/glg_lc_medres34_bn260217388.gif