TITLE: GCN CIRCULAR NUMBER: 32130 SUBJECT: GRB 220527A: Fermi GBM Final Localization DATE: 22/05/27 14:55:26 GMT FROM: Joe Mangan at UCD The Fermi GBM team reports the detection of a likely Long GRB. At 09:17:15.73 UT on 27 May 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220527A (trigger 675335840 / 220527387). The on-ground calculated location, using the GBM trigger data, is RA = 323.8, DEC = -10.6 (J2000 degrees, equivalent to 21 h 35 m, -10 d 34 '), with a statistical uncertainty of 1 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ). The angle from the Fermi LAT boresight at the GBM trigger time is 43 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220527387/quicklook/glg_skymap_all_bn220527387.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220527387/quicklook/glg_healpix_all_bn220527387.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220527387/quicklook/glg_lc_medres34_bn220527387.gif