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GCN Circular 12255

Subject
Fermi GBM detection of a SGR-like burst
Date
2011-08-08T01:47:36Z (13 years ago)
From
Sylvain Guiriec at UAH <sylvain.guiriec@lpta.in2p3.fr>
Sylvain Guiriec (UAH), C. Kouveliotou (NASA/MSFC)
and A.J. van der Horst (USRA)
report on behalf of the Fermi/GBM Team:

"The Fermi Gamma-ray Burst Monitor (GBM) triggered at 23:16:24.91 UT
on 7 August 2011 (trigger 334451786 / 110807970) on an SGR-like event,
�possibly associated with the source identified earlier by the Swift team
�as a new SGR (D'Elia et al. GCN 12253).

The on-ground location, using the GBM trigger data,
is RA = 279.0, Dec = -5.9 (J2000 degrees, equivalent to 18h36m, -5h52m),
�with an uncertainty of 6.3 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic error which is
�currently estimated to be 2 to 3 degrees).
The angle from the LAT boresight is 72 degrees.

The duration of this event is ~0.1s with little emission beyond 100 keV,
�which is typical of SGR bursts. This location is consistent with
�the burst detected ~3.3 hours earlier with Swift
�(D'Elia et al. GCN 12253), strongly suggesting that the GBM burst
�may originate from the same source. However, since this is a very
�crowded region which includes 8 SGR sources already, we cannot exclude
�as the origin of this event any of the other SGRs, given the large GBM
�error box.

The results presented above are preliminary. Further follow up observations
�are strongly encouraged. "
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