TITLE:   GCN CIRCULAR
NUMBER:  40462
SUBJECT: GRB 250515A: Fermi GBM Final Localization
DATE:    25/05/15 21:34:47 GMT
FROM:    R. Hamburg at CNRS/IJCLab <rachel.k.hamburg@gmail.com>

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

"At 20:46:21.91 UT on 15 May 2025, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 250515A (trigger 769034786/250515866).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 154.35, Dec = 23.19 (J2000 degrees, equivalent to J2000 10h 17m, +23d 11'),
with a statistical uncertainty of 7.76 degrees.

The angle from the Fermi LAT boresight is 69 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250515866/quicklook/glg_skymap_all_bn250515866.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/bn250515866/quicklook/glg_healpix_all_bn250515866.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250515866/quicklook/glg_lc_medres34_bn250515866.gif"