GCN Circular 12179
Subject
Swift J1822.3-1606 : Fermi GBM observation
Date
2011-07-19T15:58:48Z (15 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) and Chryssa Kouveliotou (NASA/MSFC) report on behalf of
the Fermi GBM Team:
"At 12:47:54.38 UT on 14 July 2001, the Fermi Gamma-Ray Burst Monitor
triggered (trigger 332340476 / 110714533)
on a very short event with a soft spectrum. The source of the emission was
later identified as a new source,
Swift J1822.3-1606 (Cummings et al. GCN Circ. 12159).
The GBM on-ground location is consistent with the Swift position.
The event duration is approximately 8 ms. Its spectrum is adequately fit
with either an optically thin thermal
bremsstrahlung (OTTB) model of kT = 37 +/- 5 keV or a power law with an
exponential cutoff (COMPT) with
index = 0.2 +/- 0.6 and Epeak = 40 +/-3 keV. The event fluence (10-1000 keV)
is ~4 x E-08 erg/cm2.
Visual observation of the GBM data revealed at least three and possibly four
additional
events near the trigger time ranging in duration between 10 - 30 ms.
Preliminary analysis indicates a harder
spectrum for these non-triggered events. "