GCN Circular 17364
Subject
GRB 150127B: Fermi GBM detection
Date
2015-01-30T17:36:16Z (9 years ago)
From
Peter Jenke at MSFC <peter.a.jenke@nasa.gov>
P. Jenke (UAH) and A. von Kienlin (MPE) report
on behalf of the Fermi GBM Team:
"At 14:08:26.68 UT on January 27 2015, the Fermi Gamma-Ray Burst
Monitor triggered and located
GRB 150127B (trigger 444060509/150127589). The GBM on-ground
location, using the Fermi GBM trigger data, is consistent with
the IPN Triangulation (K. Hurley et al., GCN 17360). This burst
was also observed by Konus-Wind (S. Golenetskii et al., GCN 17363).
The angle of the burst direction to the Fermi LAT boresight is
80 degrees.
The GBM light curve consists of two peaks with a duration
(T90) of about 61 s (50-300 keV).
The time-averaged spectrum from T0+0.0 s to T0+79 s is
adequately fit by a Band function with Epeak = 240 +/- 7 keV,
Alpha =-1.08 +/- 0.01 and Beta = -2.8 +/- 0.2. The spectrum is also
well fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.09 +/- 0.01
and the cutoff energy, parameterized as Epeak, is 250 +/- 5 keV.
The event fluence (10-1000 keV) in this time interval is
(1.99 +/- 0.01)E-05 erg/cm^2. The 1 s peak photon flux measured
starting from T0+55 s in the 10-1000 keV band
is 19.8 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."