GCN Circular 19041
Subject
GRB 160219A: Fermi GBM detection
Date
2016-02-21T10:45:48Z (8 years ago)
From
Hoi-Fung Yu at MPE <sptfung@mpe.mpg.de>
H.-F. Yu (MPE) and O. J. Roberts (UCD),
report on behalf of the Fermi GBM Team:
"At 06:56:18.14 UT on the 19th of February 2015, the Fermi
Gamma-Ray Burst Monitor (GBM) triggered and located GRB 160219A
(trigger 477557782 / 160219289). The on-ground calculated location,
using the Fermi GBM trigger data, is RA = 350.6, Dec = -29.7 deg.
(J2000 degrees, equivalent to 23h 22m 24s, -29d 42'), with a
statistical uncertainty of 6.34 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic error which we
have characterized as a core-plus-tail model, with 90% of GRBs having
a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).
The angle from the Fermi LAT boresight for the IPN position
is 51 degrees (Svinkin et al. 2016, GCN 19035).
The GBM light curve consists of two short pulses with a duration
(T90) of about 3.5 s (50-300 keV). The time-averaged spectrum from
T0-0.064 s to T0+3.456 s is best fit by a power law function with
an exponential high-energy cutoff. The power law index is
-0.97 +/- 0.15 and the cutoff energy, parameterized as Epeak, is
689 +/- 308 keV.
The event fluence (10-1000 keV) in this time interval is
(1.25 +/- 0.12)E-06 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.00 s in the 10-1000 keV band is
19.2 +/- 1.1 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."