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 10319

GRB 100111A: Fermi GBM observation
2010-01-11T16:24:31Z (14 years ago)
Sheila McBreen at MPE <>
S. McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team:

"At 04:12:49.70 UT on 11 January 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100111A (trigger 284875971 / 100111176)
which was also detected by the Swift-BAT (Vetere et al. 2010, GCN 10317).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 32 degrees.

The GBM light curve consists of one main pulse
with a duration of about 12 s (8-1000 keV).
The time-averaged spectrum from T0-2.7 s to T0+5.5 s is
adequately fit by a simple power law function
with index -1.66 (+0.05/-0.06) (CSTAT 452 for 363 d.o.f.).

The event fluence (8-1000 keV) in this time interval is
(1.5 +/- 0.1 )E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.003 s in the 8-1000 keV band
is 3.5 +/- 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