GCN Circular 17481
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."