[vsnet-grb-info 25366] GRB 200327A: Fermi GBM detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27466
SUBJECT: GRB 200327A: Fermi GBM detection
DATE:    20/03/29 01:40:48 GMT
FROM:    Peter Veres at UAH  <veresp at gmail.com>

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

"At 20:56:48.17 UT on 27 March 2020, the Fermi Gamma-Ray Burst Monitor
(GBM) triggered
and located GRB 200327A (trigger 607035413 / 200327873) which was also
detected by AGILE-MCAL (Ursi et al., GCN 27461) and localized by IPN (Svinkin
et al., GCN 27463). The GBM on-ground location is consistent with the IPN
position.

The angle from the Fermi LAT boresight at the GBM trigger time is 104
degrees.

The GBM light curve consists of two pulses with a duration (T90) of about
0.64 s (50-300 keV). The time-averaged spectrum from T0-64 ms to T0+192 ms
is best fit by a power law function with an exponential high-energy
cutoff.  The power law index is -0.60 +/- 0.09 and the cutoff energy,
parameterized as Epeak, is 1100 +/- 180 keV.

The event fluence (10-1000 keV) in this time interval is (1.53 +/- 0.06)E-6
erg/cm^2. The 64 ms peak photon flux measured starting from T0+64 ms in the
10-1000 keV band is 19.2 +/- 1.4 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/"