[AAVSO-HEN] GRB 090510B: Fermi GBM detection

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9347
SUBJECT: GRB 090510B: Fermi GBM detection
DATE:    09/05/11 16:02:42 GMT
FROM:    Arne Rau at MPE  <arau at mpe.mpg.de>

Arne Rau (MPE) reports on behalf of the Fermi GBM Team:

"At 07:47:39.51  UT on 10 May 2009, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 090510B (trigger 263634461  / 090510325).

The on-ground calculated location, using the GBM trigger
data, is RA = 269.4 , DEC = -57.9 (J2000 degrees,
equivalent to 17h 57m, -57d 56'), with an uncertainty
of 11.6 degrees (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).

The GBM light curve shows a single peak  with a duration (T90)
of about 7s (8-1000 keV).

The angle from the Fermi LAT boresight is 100 degrees.
Since the source is weak, the time-averaged spectrum is poorly 
constrained."