[vsnet-grb-info 7366] GRB 090304: Fermi GBM detection
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Mar 5 01:14:50 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8930
SUBJECT: GRB 090304: Fermi GBM detection
DATE: 09/03/04 16:14:43 GMT
FROM: Arne Rau at MPE <arau at mpe.mpg.de>
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"At 05:10:48.16 UT on 04 March 2009, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 090304 (trigger 257836250 / 090304.216).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 246.4, Dec = -80.9 (J2000 degrees, equivalent to
J2000 16h 25m, -80d 54'), with a statistical uncertainty of 13.1 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 Fermi LAT boresight is 31 degrees.
Since the source is weak, the time-averaged spectrum is poorly constrained.
This event has also been detected by INTEGRAL SPI-ACS."
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