TITLE: GCN CIRCULAR NUMBER: 42044 SUBJECT: GRB 250930A: Fermi GBM Final Localization DATE: 25/10/01 17:22:07 GMT FROM: Eva MP eva.palafox@gmail.com
The Fermi GBM team reports the detection of a likely LONG GRB
"At 20:59:58.57 UT on 30 September 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250930A (trigger 780958803/250930875).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 336.97, Dec = -44.97 (J2000 degrees, equivalent to J2000 22h 27m, -44d 58'), with a statistical uncertainty of 3.27 degrees.
The angle from the Fermi LAT boresight is 109 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250930875/q...
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250930875/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250930875/q..."
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