TITLE: GCN CIRCULAR NUMBER: 41051 SUBJECT: GRB 250709A: Fermi GBM Final Localization DATE: 25/07/09 17:32:31 GMT FROM: oindabimukherjee@gmail.com

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

"At 15:39:54.99 UT on 09 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250709A (trigger 773768399/250709653).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 303.29, Dec = 34.66 (J2000 degrees, equivalent to J2000 20h 13m, +34d 39'), with a statistical uncertainty of 4.56 degrees.

The angle from the Fermi LAT boresight is 24 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250709653/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/bn250709653/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250709653/q..."

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