TITLE:   GCN CIRCULAR
NUMBER:  43765
SUBJECT: GRB 260216A: Fermi GBM Final Real-time Localization
DATE:    26/02/16 21:26:38 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 21:15:57 UT on 16 Feb 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260216A (trigger 792969362.07265 / 260216886).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 292.5, Dec = -25.0 (J2000 degrees, equivalent to J2000 19h 30m, -25d 00'), with a statistical uncertainty of 12.6 degrees.

The angle from the Fermi LAT boresight is 127.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260216886/quicklook/glg_skymap_all_bn260216886.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/bn260216886/quicklook/glg_healpix_all_bn260216886.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260216886/quicklook/glg_lc_medres34_bn260216886.gif