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TITLE:   GCN CIRCULAR
NUMBER:  27422
SUBJECT: GRB 200323A: Fermi GBM Final Real-time Localization
DATE:    20/03/23 18:56:53 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 18:46:32 UT on 23 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200323A (trigger 606681997.955906 / 200323782).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 156.5, Dec = -55.5 (J2000 degrees, equivalent to J2000 10h 26m, -55d 30'), with a statistical uncertainty of 1.4 degrees.

The angle from the Fermi LAT boresight is 18.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200323782/quicklook/glg_skymap_all_bn200323782.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/bn200323782/quicklook/glg_healpix_all_bn200323782.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200323782/quicklook/glg_lc_medres34_bn200323782.gif

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TITLE:   GCN CIRCULAR
NUMBER:  27423
SUBJECT: GRB 200323A: Fermi GBM detection
DATE:    20/03/23 22:23:15 GMT
FROM:    Peter Veres at UAH  <veresp@gmail.com>

P. Veres and C. Meegan (both UAH)
report on behalf of the Fermi GBM Team:

"At 18:46:32.96 UT on 23 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200323A (trigger 606681997 / 200323782).

The location for this GRB was reported in the Fermi GBM Final Real-time
Localization GCN (GCN 27422).

The angle from the Fermi LAT boresight at the GBM trigger time is 18
degrees.

The GBM light curve consists of of a single pulse
with a duration (T90) of about 2.1 s (50-300 keV).
The time-averaged spectrum from T0 to T0+3.6 s is
best fit by a Band function with Epeak = 63.0 +/- 3.7 keV,
alpha = -0.73 +/- 0.10, and beta = -2.50 +/- 0.09.

The event fluence (10-1000 keV) in this time interval is
(3.23 +/- 0.10)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.32 s in the 10-1000 keV band
is 25.60 +/- 0.44 ph/s/cm^2. The 64 ms peak photon flux measured
starting from T0+0.58 s in the same band
is 34.0 +/- 1.9 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html

For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"