GCN Circular 13468
Subject
GRB 120711A: INTEGRAL/SPI observations
Event
Date
2012-07-14T12:08:26Z (13 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
L. Hanlon (UCD), A. Martin-Carrillo (UCD), X.-L. Zhang (MPE) and A. von Kienlin
(MPE) report:
"The bright and long GRB detected by IBAS in the INTEGRAL IBIS/ISGRI data
at 02:44:48 UT on July 11th 2012 (Gotz et al., GCN 13434 ) was also observed
by the Spectrometer SPI onboard INTEGRAL, in addition to the detection by
its anticoincidence shield (SPI-ACS). The event was located in the field
of view of SPI, which allows spectral analysis of this event.
The light curve from SPI events starts with a precursor at 02:44:50 UT followed
by a bright double peaked main emission phase at 02:45:55 UT with a duration
of about 50 sec. The emission during the main peak is seen up to ~3 MeV.
We searched for the faint and soft emission after the main outburst reported by
E. Bozzo et al. (GCN 13435) and S. Golenetskii et al. (GCN 13446).
We find a weak tail in the 20 to 100 keV energy range, lasting for about 800 s
after the main emission phase .
The time-integrated spectrum of the main emission phase is well fitted (in
the 20 keV - 3 MeV range) by an exponential cutoff powerlaw model, with
photon index = 1.00+/-0.03 and an high energy cutoff at 1200 +/- 200 keV.
The fluence during the 50 seconds main emission phase in the 20-1000 keV
range is (2.26 +/- 0.04)E-4 erg/cm^2.
The spectral analysis results presented above are preliminary."