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TITLE:   GCN CIRCULAR
NUMBER:  27476
SUBJECT: GRB 200402B: BALROG localization (Fermi Trigger 607537834 / GRB 200402688)
DATE:    20/04/02 16:53:08 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
607537834 at 16:30:29 on 02 April 2020 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) = 193.9+/-2.2 deg
Decl.(2000.0) = -10.1+/-2.7 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200402688/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200402688/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200402688/json

                        

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TITLE:   GCN CIRCULAR
NUMBER:  27478
SUBJECT: GRB 200402B: Fermi GBM Final Localization
DATE:    20/04/02 17:36:11 GMT
FROM:    Peter Veres at UAH  <veresp@gmail.com>

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

At 16:30:29.65 UT on 2 Apr 2020, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 200402B (trigger 607537834 / 200402688). This
trigger was initially classified as a particle event by the flight
software, but is in fact a GRB.

The on-ground calculated location, using the Fermi GBM trigger data, is RA
= 190.1, Dec = -6.6 (J2000 degrees, equivalent to J2000 12h 40m, -06d 36'),
with a statistical uncertainty of 6.5 degrees.

The angle from the Fermi LAT boresight is 88 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200402688/quicklook/glg_skymap_all_bn200402688.png

The HEALPix FITS file, including the estimated localization systematic, can
be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200402688/quicklook/glg_healpix_all_bn200402688.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200402688/quicklook/glg_lc_medres34_bn200402688.gif