Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 12545

GRB 111107A: Fermi GBM observation
2011-11-08T21:37:43Z (13 years ago)
Veronique Pelassa at UAH <>
V. Pelassa (UAH) reports on behalf of the Fermi GBM Team:

"At 00:50:25.48 UT on 07 November 2011, the Fermi Gamma-Ray Burst
Monitor triggered and located GRB 111107A (trigger 342319827 /
111107035) which was also detected by the Swift/BAT (Siegel et al.
2011, GCN 12534). The GBM on-ground location is consistent with the
Swift position. The angle from the Fermi LAT boresight is 119 degrees.

The GBM light curve consists of a FRED-like pulse with a duration
(T90) of about 12 s (50-300 keV). The time-averaged spectrum from
T0-1.024 s to T0+11.264 s is well fit by a power law function with an
exponential high-energy cutoff. The power law index is -1.38 +/- 0.21
and the cutoff energy, parameterized as Epeak, is 108 +/- 32 keV
(Castor statistics 318.55 for 365 d.o.f.).

The event fluence (10-1000 keV) in this time interval is
(1.392 +/- 0.197)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.96 s in the 10-1000 keV band is
2.6 +/- 0.3 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
Looking for U.S. government information and services? Visit