TITLE:   GCN CIRCULAR
NUMBER:  40531
SUBJECT: GRB 250522B: Fermi GBM Final Localization
DATE:    25/05/23 00:55:12 GMT
FROM:    Matt Godwin <msg0028@uah.edu>

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

"At 17:08:52.84 UT on 22 May 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250522B (trigger 769626537/250522714).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 285.32, Dec = -54.30 (J2000 degrees, equivalent to J2000 19h 1m, -54d 17'),
with a statistical uncertainty of 11.40 degrees.

The angle from the Fermi LAT boresight is 80 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250522714/quicklook/glg_skymap_all_bn250522714.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250522714/quicklook/glg_healpix_all_bn250522714.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250522714/quicklook/glg_lc_medres34_bn250522714.gif"