[vsnet-grb-info 19992] GRB 171030A: Fermi GBM detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22079
SUBJECT: GRB 171030A: Fermi GBM detection
DATE:    17/11/01 21:29:07 GMT
FROM:    Rachel Hamburg at UAH  <rkh0007 at uah.edu>

R. Hamburg (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 17:29:45.12 UT on 30 October 2017, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 171030A (trigger 531077390 / 171030729)
which was also detected by Swift/BAT and INTEGRAL/SPI-ACS, as reported
by the Interplanetary Network (GCN 22076). The GBM on-ground location is
consistent with the Swift/BAT location (GCN 22078).

The angle from the Fermi LAT boresight at the GBM trigger time is 135
degrees.

The GBM light curve shows a single peak
with a duration (T90) of about 0.1 s (50-300 keV).
The time-averaged spectrum from T0-0.06 s to T0+0.00 s is
adequately fit by a simple power law function with index -1.11 +/- 0.07.

The event fluence (10-1000 keV) in this time interval is
(1.7 +/- 0.2)E-07 erg/cm^2. The 0.064-sec peak photon flux measured
starting from T0-0.064 s in the 10-1000 keV band
is 11.6 +/- 2.2 ph/s/cm^2.

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