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 13437

GRB 120711A: Fermi GBM observation
2012-07-11T10:18:39Z (12 years ago)
David Gruber at MPE <>
David Gruber (MPE) and V�ronique Pelassa (UAH)
report on behalf of the Fermi GBM Team:

"At 02:44:53.29 UT on 11 July 2012, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 120711A (trigger 363667496 / 120711115).
which was also detected by the INTEGRAL/IBAS
(Gotz et al. 2012, GCN 13434).
The GBM on-ground location is consistent with the INTEGRAL position.

The angle from the Fermi LAT boresight is 140 degrees.
Moreover, this burst was bright enough to result in a Fermi spacecraft
autonomous rapid repoint (ARR) maneuver.

This burst was also independently detected by INTEGRAL SPI-ACS.

The GBM light curve consists of a precursor which is
followed by a hard, main emission after ~ 50 s, lasting for
another ~ 50 s. The T90 is about 44 s (50-300 keV).
The time-averaged spectrum from T0-1 s to T0+131 s is
best fit by a Band function with Epeak = 973 +/- 35 keV,
alpha = -0.94 +/- 0.01, and beta = -2.40 +/- 0.04.
This spectrum is typical of a bright, hard GRB, and would be 
highly unusual for an X-ray transient (Bozzo et al. 2012, GCN 13435).

The event fluence (10-1000 keV) in this time interval is
(1.942 +/- 0.002)E-04 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+95 s in the 10-1000 keV band
is 26.7 +/- 0.6 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