GCN Circular 44523
Subject
GRB 260510D: Fermi GBM Final Real-time Localization
Event
Date
2026-05-10T20:48:45Z (4 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 20:38:08 UT on 10 May 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260510D (trigger 800138293.771294 / 260510860).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 3.0, Dec = 37.4 (J2000 degrees, equivalent to J2000 00h 12m, 37d 23'), with a statistical uncertainty of 13.9 degrees.
The angle from the Fermi LAT boresight is 61.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260510860/quicklook/glg_skymap_all_bn260510860.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/bn260510860/quicklook/glg_healpix_all_bn260510860.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260510860/quicklook/glg_lc_medres34_bn260510860.gif