[vsnet-grb-info 19781] GCN GRB 170903A
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Sep 5 05:49:14 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21813
SUBJECT: GCN GRB 170903A
DATE: 17/09/04 20:48:43 GMT
FROM: Francesco Berlato at MPE <fberlato at mpe.mpg.de>
F Berlato (MPE) and C Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 12:49:07.79 UT on 3 September 2017, the Fermi Gamma-Ray Burst
Monitor
triggered and located GRB 170903A (trigger 526135752 / 170903534),
which
was also detected by the Swift/BAT (Markwardt et al., GCN 21793).
The Swift localization, consistent with the GBM one, is RA = 254.532
deg,
DEC = 34.985 deg (J2000, equivalent to 16h 58m 7.7s, +34d 59' 7.5"),
with an uncertainty of 1.3 arcmin (radius, sys+stat, 90% containment).
The angle from the Fermi LAT boresight at the GBM trigger time is 93
deg.
The GBM light curve shows two pulses with a duration (T90) of
about 25 s (50-300 keV). The time-averaged spectrum from
T0-1.5 s to T0+25.5 s is adequately fit by a Comptonized model,
with index -1.56 +/- 0.10 and Epeak 124 +/- 33 keV .
The event fluence (10-1000 keV) in the time interval is
(4.34 +/- 0.54)E-06 erg/cm^2. The 1-sec peak photon flux (10-1000 keV)
measured starting from T0-1.5 s is (5.80 +/- 0.36) ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
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