TITLE: GCN CIRCULAR NUMBER: 40555 SUBJECT: GRB 250527A: Fermi GBM Final Localization DATE: 25/05/27 19:44:11 GMT FROM: eliza.neights@gmail.com

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

"At 17:06:07.26 UT on 27 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250527A (trigger 770058372/250527713).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 30.5, Dec = 15.0 (J2000 degrees, equivalent to J2000 2h 2m, 15d 2'), with a statistical uncertainty of 9.7 degrees.

The angle from the Fermi LAT boresight is 58.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250527713/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/bn250527713/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250527713/q..."

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