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GCN Circular 32147

Subject
GRB 220528A: Fermi GBM Final Localization
Date
2022-05-28T15:21:54Z (2 years ago)
From
Joe Mangan at UCD <joseph.mangan@ucdconnect.ie>
The Fermi GBM team reports the detection of a likely short GRB.

At 06:12:47.41 UT on 28 May 2022, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 220528A (trigger 675411172 / 220528259).

The on-ground calculated location, using the GBM trigger
data, is RA = 311.2, DEC = 24.3 (J2000 degrees,
equivalent to 20 h 44 m, 24 d 18 '), with a statistical uncertainty
of 4.9 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 68
degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220528259/quicklook/glg_skymap_all_bn220528259.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/bn220528259/quicklook/glg_healpix_all_bn220528259.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220528259/quicklook/glg_lc_medres34_bn220528259.gif
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