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TITLE:   GCN CIRCULAR
NUMBER:  30647
SUBJECT: GRB 210815A: Fermi GBM Final Real-time Localization
DATE:    21/08/15 02:34:12 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM  <do_not_reply@GIOC.nsstc.nasa.gov>

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

At 02:23:49 UT on 15 Aug 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210815A (trigger 650687034.634966 / 210815100).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 351.8, Dec = -30.2 (J2000 degrees, equivalent to J2000 23h 27m, -30d 11'), with a statistical uncertainty of 2.9 degrees.

The angle from the Fermi LAT boresight is 98.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210815100/quicklook/glg_skymap_all_bn210815100.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210815100/quicklook/glg_healpix_all_bn210815100.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210815100/quicklook/glg_lc_medres34_bn210815100.gif

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TITLE:   GCN CIRCULAR
NUMBER:  30648
SUBJECT: GRB 210815A: BALROG localization (Fermi Trigger 650687034 / GRB 210815100)
DATE:    21/08/15 07:49:08 GMT
FROM:    Jochen Greiner at MPE,Garching  <jcg@mpe.mpg.de>

F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
650687034 at 02:23:49 on 15 Aug. 2021 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).

The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 347.5+/-2.7 deg
Decl.(2000.0) = -39.9+/-2.7 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB210815100/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB210815100/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB210815100/json