GCN Circular 23810
Subject
GRB 190129A: Fermi GBM detection
Date
2019-01-29T21:36:58Z (6 years ago)
From
Bagrat Mailyan at UAH <bm0054@uah.edu>
E. Bissaldi (Politecnico & INFN Bari), B. Mailyan (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 12:21:41.87 UT on 29 January 2019, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 190129A (trigger 570457306 / 190129515),
which was also detected by MAXI/GSC (Nakahira et al. 2019, GCN 23806).
The GBM on-ground location is consistent with the MAXI/GSC position.
The angle from the Fermi LAT boresight at the GBM trigger time is 118
degrees.
The GBM light curve shows/consists of a single peak
with a duration (T90) of about 8.7 s (50-300 keV).
The time-averaged spectrum from T0-1 s to T0+4 s is
adequately fit by
a power law function with an exponential
high-energy cutoff. The power law index is -1.37 +/- 0.23 and
the cutoff energy, parameterized as Epeak, is 78 +/- 19 keV.
The event fluence (10-1000 keV) in this time interval is
(9 +/- 1)E-07 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.38 s in the 10-1000 keV band
is 3.7 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."