GCN 45108: Fermi GBM trigger 805087514/260707142 (GRB 260707A) is not a GRB
2026-07-07T19:31:42.798Z | rev 0
S. Bala (USRA) reports report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 805087514/260707142 at 03:25:09.33 UT on 07 July 2026, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to Terrestrial Gamma-ray Flash (TGF)."
GCN 45096: GRB 260707A: Fermi GBM Final Real-time Localization
2026-07-07T03:36:24.650Z | rev 0
The Fermi GBM team reports the detection of a likely SHORT GRB
At 03:25:09 UT on 7 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260707A (trigger 805087514.330134 / 260707142).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 283.4, Dec = -54.7 (J2000 degrees, equivalent to J2000 18h 53m, -54d 42'), with a statistical uncertainty of 13.3 degrees.
The angle from the Fermi LAT boresight is 165.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260707142/quicklook/glg_skymap_all_bn260707142.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/bn260707142/quicklook/glg_healpix_all_bn260707142.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260707142/quicklook/glg_lc_medres34_bn260707142.gif