[vsnet-grb-info 16472] GRB 150424B: Fermi GBM detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17753
SUBJECT: GRB 150424B: Fermi GBM detection
DATE:    15/04/24 18:34:27 GMT
FROM:    Binbin Zhang at UAH  <binbin.zhang at uah.edu>

Bin-Bin Zhang (UAH) and A. von Kienlin (MPE) reports on behalf of the
Fermi GBM Team:

"At 09:39:59.68 UT on 24 April 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150424B (trigger 451561202 / 150424403),
which was also detected by the MAXI/GSC (Ono et al. 2015, GCN 17746).
The GBM on-ground location is consistent with the MAXI/GSC position.
The angle from the Fermi LAT boresight is about 107 degrees.

The GBM light curve shows a single pulse with a duration (T90)
of about 36.1 s (50-300 keV). The time-averaged spectrum from
T0-8 s to T0+28 s is best fit by a Band function with
Epeak = 56.6 +/- 8.1 keV, alpha = -0.8 +/- 0.3, and beta = -2.4 +/- 0.2.

The event fluence (10-1000 keV) in this time interval is
(3.85 +/- 0.31)E-06 erg/cm^2. The 1.024-sec peak photon flux
measured starting from T0-0.4 s in the 10-1000 keV band
is 3.8 +/- 0.3 ph/s/cm^2.

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