[vsnet-grb-info 16200] GRB 150219A: Fermi GBM observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17481
SUBJECT: GRB 150219A: Fermi GBM observation
DATE:    15/02/20 10:02:13 GMT
FROM:    Andreas von Kienlin at MPE  <azk at mpe.mpg.de>

A. von Kienlin (MPE) and C. Meegan (UAH) 
report on behalf of the Fermi GBM Team:

"At 12:31:12.26 UT on 19 February 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150219A (trigger 446041875 / 150219522), which
was also detected by INTEGRAL/IBIS (Mereghetti  et al. 2015, GCN 17476).
The GBM on-ground location is consistent with the INTEGRAL position.

The angle from the Fermi LAT boresight is 105 degrees.

The GBM light curve shows a structured pulse
with a duration (T90) of about 36 s (50-300 keV).
The time-averaged spectrum from T0-2.304 s to T0+38.657 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -0.92 (+0.08/-0.07)  and
the cutoff energy, parameterized as Epeak, is 202.7(+23.2/-19.1) keV.

The event fluence (10-1000 keV) in this time interval is
(1.00 +/- 0.05)E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+9.664 s in the 10-1000 keV band
is 4.2 +/- 0.3 ph/s/cm^2.

A Band function fits the spectrum equally well with Epeak=
166.7(+24.3/-17.3) keV, 
alpha = -0.82 +/- 0.10 and beta = -2.17 (+0.13/-0.24).

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."